| Form N-CSR Cover | 12 Months Ended |
| Aug. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | JOHN HANCOCK FUNDS II |
| Entity Central Index Key | 0001331971 |
| Document Period End Date | Aug. 31, 2024 |
| Shareholder Report | 12 Months Ended |
| Aug. 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | JOHN HANCOCK FUNDS II |
| Entity Central Index Key | 0001331971 |
| Document Period End Date | Aug. 31, 2024 |
| C000221529 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2065 Lifetime Blend Portfolio |
| Class Name | Class 1 |
| Trading Symbol | JAAFX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2065 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/underlying-funds |
| Additional Information Phone Number | 800-344-1029 |
| Additional Information Website | jhinvestments.com/underlying-funds |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2065 Lifetime Blend Portfolio $ 0.05 % |
| Expenses Paid, Amount | $ 6 |
| Expense Ratio, Percent | 0.05% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2065 Lifetime Blend Portfolio (Class 1/JAAFX) returned 21.39% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution U.S. large cap funds were the top contributors in equities TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Defensive equities The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year Since inception 2065 Lifetime Blend Portfolio (Class 1/JAAFX) 21.39 % 11.76 % S&P 500 Index 27.14 % 16.26 % S&P Target Date 2060+ Index 21.09 % 12.02 % John Hancock 2065 Lifetime Index 21.69 % 11.72 % |
| Performance Inception Date | Sep. 23, 2020 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 75,076,096 |
| Holdings Count | Holding | 24 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 41% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 57.4 % Equity 55.1 % Fixed income 2.3 % Unaffiliated investment companies 41.2 % Equity 41.2 % U.S. Government and Agency obligations 1.3 % U.S. Government 1.3 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000228345 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2065 Lifetime Blend Portfolio |
| Class Name | Class A |
| Trading Symbol | JHBLX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2065 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2065 Lifetime Blend Portfolio $ 0.42 % |
| Expenses Paid, Amount | $ 46 |
| Expense Ratio, Percent | 0.42% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2065 Lifetime Blend Portfolio (Class A/JHBLX) returned 20.92% (excluding sales charges) for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution U.S. large cap funds were the top contributors in equities TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Defensive equities The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year Since inception 2065 Lifetime Blend Portfolio (Class A/JHBLX) 14.87 % 9.97 % 2065 Lifetime Blend Portfolio (Class A/JHBLX)—excluding sales charge 20.92 % 11.42 % S&P 500 Index 27.14 % 16.26 % S&P Target Date 2060+ Index 21.09 % 12.02 % John Hancock 2065 Lifetime Index 21.69 % 11.72 % |
| Performance Inception Date | Sep. 23, 2020 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 75,076,096 |
| Holdings Count | Holding | 24 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 41% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 57.4 % Equity 55.1 % Fixed income 2.3 % Unaffiliated investment companies 41.2 % Equity 41.2 % U.S. Government and Agency obligations 1.3 % U.S. Government 1.3 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000221527 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2065 Lifetime Blend Portfolio |
| Class Name | Class R4 |
| Trading Symbol | JAAJX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2065 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2065 Lifetime Blend Portfolio $ 0.20 % |
| Expenses Paid, Amount | $ 22 |
| Expense Ratio, Percent | 0.20% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2065 Lifetime Blend Portfolio (Class R4/JAAJX) returned 21.18% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution U.S. large cap funds were the top contributors in equities TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Defensive equities The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year Since inception 2065 Lifetime Blend Portfolio (Class R4/JAAJX) 21.18 % 11.57 % S&P 500 Index 27.14 % 16.26 % S&P Target Date 2060+ Index 21.09 % 12.02 % John Hancock 2065 Lifetime Index 21.69 % 11.72 % |
| Performance Inception Date | Sep. 23, 2020 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 75,076,096 |
| Holdings Count | Holding | 24 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 41% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 57.4 % Equity 55.1 % Fixed income 2.3 % Unaffiliated investment companies 41.2 % Equity 41.2 % U.S. Government and Agency obligations 1.3 % U.S. Government 1.3 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000221528 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2065 Lifetime Blend Portfolio |
| Class Name | Class R6 |
| Trading Symbol | JAAKX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2065 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2065 Lifetime Blend Portfolio $ 0.01 % |
| Expenses Paid, Amount | $ 1 |
| Expense Ratio, Percent | 0.01% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2065 Lifetime Blend Portfolio (Class R6/JAAKX) returned 21.46% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution U.S. large cap funds were the top contributors in equities TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Defensive equities The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $1,000,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $1,000,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year Since inception 2065 Lifetime Blend Portfolio (Class R6/JAAKX) 21.46 % 11.78 % S&P 500 Index 27.14 % 16.26 % S&P Target Date 2060+ Index 21.09 % 12.02 % John Hancock 2065 Lifetime Index 21.69 % 11.72 % |
| Performance Inception Date | Sep. 23, 2020 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 75,076,096 |
| Holdings Count | Holding | 24 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 41% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 57.4 % Equity 55.1 % Fixed income 2.3 % Unaffiliated investment companies 41.2 % Equity 41.2 % U.S. Government and Agency obligations 1.3 % U.S. Government 1.3 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132735 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2010 Lifetime Blend Portfolio |
| Class Name | Class 1 |
| Trading Symbol | JRLDX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2010 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/underlying-funds |
| Additional Information Phone Number | 800-344-1029 |
| Additional Information Website | jhinvestments.com/underlying-funds |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2010 Lifetime Blend Portfolio $ 0.22 % |
| Expenses Paid, Amount | $ 23 |
| Expense Ratio, Percent | 0.22% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2010 Lifetime Blend Portfolio (Class 1/JRLDX) returned 11.97% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS All segments of the fund gained The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS There were no major detractors Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2010 Lifetime Blend Portfolio (Class 1/JRLDX) 11.97 % 4.77 % ) 4.66 % Bloomberg U.S. Aggregate Bond Index 7.30 % (0.04 ) % 1.64 % S&P Target Date 2010 Index 12.24 % 5.11 % ) 4.73 % John Hancock 2010 Lifetime Index 12.14 % 5.06 % ) 4.94 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 67,032,441 |
| Holdings Count | Holding | 33 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 74% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 41.8 % Fixed income 27.4 % Equity 14.4 % Unaffiliated investment companies 49.5 % Fixed income 31.8 % Equity 17.7 % U.S. Government and Agency obligations 8.7 % U.S. Government 8.7 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000228330 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2010 Lifetime Blend Portfolio |
| Class Name | Class A |
| Trading Symbol | JHANX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2010 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2010 Lifetime Blend Portfolio $ 0.58 % |
| Expenses Paid, Amount | $ 61 |
| Expense Ratio, Percent | 0.58% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2010 Lifetime Blend Portfolio (Class A/JHANX) returned 11.57% (excluding sales charges) for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS All segments of the fund gained The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS There were no major detractors Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2010 Lifetime Blend Portfolio (Class A/JHANX) 6.02 % 3.48 % ) 4.01 % 2010 Lifetime Blend Portfolio (Class A/JHANX)—excluding sales charge 11.57 % 4.54 % ) 4.54 % Bloomberg U.S. Aggregate Bond Index 7.30 % (0.04 ) % 1.64 % S&P Target Date 2010 Index 12.24 % 5.11 % ) 4.73 % John Hancock 2010 Lifetime Index 12.14 % 5.06 % ) 4.94 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 67,032,441 |
| Holdings Count | Holding | 33 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 74% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 41.8 % Fixed income 27.4 % Equity 14.4 % Unaffiliated investment companies 49.5 % Fixed income 31.8 % Equity 17.7 % U.S. Government and Agency obligations 8.7 % U.S. Government 8.7 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132740 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2010 Lifetime Blend Portfolio |
| Class Name | Class R4 |
| Trading Symbol | JRLFX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2010 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2010 Lifetime Blend Portfolio $ 0.37 % |
| Expenses Paid, Amount | $ 39 |
| Expense Ratio, Percent | 0.37% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2010 Lifetime Blend Portfolio (Class R4/JRLFX) returned 11.86% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS All segments of the fund gained The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS There were no major detractors Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2010 Lifetime Blend Portfolio (Class R4/JRLFX) 11.86 % 4.61 % ) 4.52 % Bloomberg U.S. Aggregate Bond Index 7.30 % (0.04 ) % 1.64 % S&P Target Date 2010 Index 12.24 % 5.11 % ) 4.73 % John Hancock 2010 Lifetime Index 12.14 % 5.06 % ) 4.94 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 67,032,441 |
| Holdings Count | Holding | 33 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 74% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 41.8 % Fixed income 27.4 % Equity 14.4 % Unaffiliated investment companies 49.5 % Fixed income 31.8 % Equity 17.7 % U.S. Government and Agency obligations 8.7 % U.S. Government 8.7 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132742 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2010 Lifetime Blend Portfolio |
| Class Name | Class R6 |
| Trading Symbol | JRLHX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2010 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2010 Lifetime Blend Portfolio $ 0.17 % |
| Expenses Paid, Amount | $ 18 |
| Expense Ratio, Percent | 0.17% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2010 Lifetime Blend Portfolio (Class R6/JRLHX) returned 12.00% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS All segments of the fund gained The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS There were no major detractors Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $1,000,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $1,000,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2010 Lifetime Blend Portfolio (Class R6/JRLHX) 12.00 % 4.82 % ) 4.71 % Bloomberg U.S. Aggregate Bond Index 7.30 % (0.04 ) % 1.64 % S&P Target Date 2010 Index 12.24 % 5.11 % ) 4.73 % John Hancock 2010 Lifetime Index 12.14 % 5.06 % ) 4.94 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 67,032,441 |
| Holdings Count | Holding | 33 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 74% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 41.8 % Fixed income 27.4 % Equity 14.4 % Unaffiliated investment companies 49.5 % Fixed income 31.8 % Equity 17.7 % U.S. Government and Agency obligations 8.7 % U.S. Government 8.7 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132759 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2025 Lifetime Blend Portfolio |
| Class Name | Class 1 |
| Trading Symbol | JRTBX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2025 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/underlying-funds |
| Additional Information Phone Number | 800-344-1029 |
| Additional Information Website | jhinvestments.com/underlying-funds |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2025 Lifetime Blend Portfolio $ 0.14 % |
| Expenses Paid, Amount | $ 15 |
| Expense Ratio, Percent | 0.14% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2025 Lifetime Blend Portfolio (Class 1/JRTBX) returned 14.65% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2025 Lifetime Blend Portfolio (Class 1/JRTBX) 14.65 % 6.92 % 6.18 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2025 Index 14.30 % 6.91 % 6.14 % John Hancock 2025 Lifetime Index 14.87 % 7.19 % 6.86 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 656,065,865 |
| Holdings Count | Holding | 36 |
| Advisory Fees Paid, Amount | $ 188,080 |
| Investment Company Portfolio Turnover | 49% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 50.5 % Equity 28.8 % Fixed income 21.7 % Unaffiliated investment companies 43.3 % Equity 23.8 % Fixed income 19.5 % U.S. Government and Agency obligations 6.2 % U.S. Government 6.2 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000228333 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2025 Lifetime Blend Portfolio |
| Class Name | Class A |
| Trading Symbol | JHAUX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2025 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2025 Lifetime Blend Portfolio $ 0.51 % |
| Expenses Paid, Amount | $ 55 |
| Expense Ratio, Percent | 0.51% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2025 Lifetime Blend Portfolio (Class A/JHAUX) returned 14.25% (excluding sales charges) for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2025 Lifetime Blend Portfolio (Class A/JHAUX) 8.50 % 5.59 % 5.53 % 2025 Lifetime Blend Portfolio (Class A/JHAUX)—excluding sales charge 14.25 % 6.68 % 6.07 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2025 Index 14.30 % 6.91 % 6.14 % John Hancock 2025 Lifetime Index 14.87 % 7.19 % 6.86 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 656,065,865 |
| Holdings Count | Holding | 36 |
| Advisory Fees Paid, Amount | $ 188,080 |
| Investment Company Portfolio Turnover | 49% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 50.5 % Equity 28.8 % Fixed income 21.7 % Unaffiliated investment companies 43.3 % Equity 23.8 % Fixed income 19.5 % U.S. Government and Agency obligations 6.2 % U.S. Government 6.2 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132764 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2025 Lifetime Blend Portfolio |
| Class Name | Class R4 |
| Trading Symbol | JRTDX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2025 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2025 Lifetime Blend Portfolio $ 0.35 % |
| Expenses Paid, Amount | $ 38 |
| Expense Ratio, Percent | 0.35% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2025 Lifetime Blend Portfolio (Class R4/JRTDX) returned 14.33% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2025 Lifetime Blend Portfolio (Class R4/JRTDX) 14.33 % 6.69 % 6.02 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2025 Index 14.30 % 6.91 % 6.14 % John Hancock 2025 Lifetime Index 14.87 % 7.19 % 6.86 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 656,065,865 |
| Holdings Count | Holding | 36 |
| Advisory Fees Paid, Amount | $ 188,080 |
| Investment Company Portfolio Turnover | 49% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 50.5 % Equity 28.8 % Fixed income 21.7 % Unaffiliated investment companies 43.3 % Equity 23.8 % Fixed income 19.5 % U.S. Government and Agency obligations 6.2 % U.S. Government 6.2 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132766 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2025 Lifetime Blend Portfolio |
| Class Name | Class R6 |
| Trading Symbol | JRTFX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2025 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2025 Lifetime Blend Portfolio $ 0.10 % |
| Expenses Paid, Amount | $ 11 |
| Expense Ratio, Percent | 0.10% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2025 Lifetime Blend Portfolio (Class R6/JRTFX) returned 14.68% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $1,000,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $1,000,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2025 Lifetime Blend Portfolio (Class R6/JRTFX) 14.68 % 6.96 % 6.24 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2025 Index 14.30 % 6.91 % 6.14 % John Hancock 2025 Lifetime Index 14.87 % 7.19 % 6.86 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 656,065,865 |
| Holdings Count | Holding | 36 |
| Advisory Fees Paid, Amount | $ 188,080 |
| Investment Company Portfolio Turnover | 49% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 50.5 % Equity 28.8 % Fixed income 21.7 % Unaffiliated investment companies 43.3 % Equity 23.8 % Fixed income 19.5 % U.S. Government and Agency obligations 6.2 % U.S. Government 6.2 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132783 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2040 Lifetime Blend Portfolio |
| Class Name | Class 1 |
| Trading Symbol | JRTTX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2040 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/underlying-funds |
| Additional Information Phone Number | 800-344-1029 |
| Additional Information Website | jhinvestments.com/underlying-funds |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2040 Lifetime Blend Portfolio $ 0.06 % |
| Expenses Paid, Amount | $ 7 |
| Expense Ratio, Percent | 0.06% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2040 Lifetime Blend Portfolio (Class 1/JRTTX) returned 19.55% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2040 Lifetime Blend Portfolio (Class 1/JRTTX) 19.55 % 10.07 % 8.13 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2040 Index 19.44 % 10.17 % 8.10 % John Hancock 2040 Lifetime Index 19.78 % 10.55 % 8.88 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 764,910,027 |
| Holdings Count | Holding | 32 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 24% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 54.8 % Equity 46.7 % Fixed income 8.1 % Unaffiliated investment companies 42.2 % Equity 37.5 % Fixed income 4.7 % U.S. Government and Agency obligations 3.0 % U.S. Government 3.0 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000228336 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2040 Lifetime Blend Portfolio |
| Class Name | Class A |
| Trading Symbol | JHBAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2040 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2040 Lifetime Blend Portfolio $ 0.43 % |
| Expenses Paid, Amount | $ 47 |
| Expense Ratio, Percent | 0.43% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2040 Lifetime Blend Portfolio (Class A/JHBAX) returned 19.14% (excluding sales charges) for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2040 Lifetime Blend Portfolio (Class A/JHBAX) 13.17 % 8.70 % 7.46 % 2040 Lifetime Blend Portfolio (Class A/JHBAX)—excluding sales charge 19.14 % 9.83 % 8.01 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2040 Index 19.44 % 10.17 % 8.10 % John Hancock 2040 Lifetime Index 19.78 % 10.55 % 8.88 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 764,910,027 |
| Holdings Count | Holding | 32 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 24% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 54.8 % Equity 46.7 % Fixed income 8.1 % Unaffiliated investment companies 42.2 % Equity 37.5 % Fixed income 4.7 % U.S. Government and Agency obligations 3.0 % U.S. Government 3.0 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132788 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2040 Lifetime Blend Portfolio |
| Class Name | Class R4 |
| Trading Symbol | JRTVX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2040 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2040 Lifetime Blend Portfolio $ 0.26 % |
| Expenses Paid, Amount | $ 29 |
| Expense Ratio, Percent | 0.26% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2040 Lifetime Blend Portfolio (Class R4/JRTVX) returned 19.32% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2040 Lifetime Blend Portfolio (Class R4/JRTVX) 19.32 % 9.87 % 7.98 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2040 Index 19.44 % 10.17 % 8.10 % John Hancock 2040 Lifetime Index 19.78 % 10.55 % 8.88 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 764,910,027 |
| Holdings Count | Holding | 32 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 24% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 54.8 % Equity 46.7 % Fixed income 8.1 % Unaffiliated investment companies 42.2 % Equity 37.5 % Fixed income 4.7 % U.S. Government and Agency obligations 3.0 % U.S. Government 3.0 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132790 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2040 Lifetime Blend Portfolio |
| Class Name | Class R6 |
| Trading Symbol | JRTWX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2040 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2040 Lifetime Blend Portfolio $ 0.02 % |
| Expenses Paid, Amount | $ 2 |
| Expense Ratio, Percent | 0.02% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2040 Lifetime Blend Portfolio (Class R6/JRTWX) returned 19.58% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $1,000,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $1,000,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2040 Lifetime Blend Portfolio (Class R6/JRTWX) 19.58 % 10.14 % 8.17 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2040 Index 19.44 % 10.17 % 8.10 % John Hancock 2040 Lifetime Index 19.78 % 10.55 % 8.88 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 764,910,027 |
| Holdings Count | Holding | 32 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 24% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 54.8 % Equity 46.7 % Fixed income 8.1 % Unaffiliated investment companies 42.2 % Equity 37.5 % Fixed income 4.7 % U.S. Government and Agency obligations 3.0 % U.S. Government 3.0 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000138480 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2055 Lifetime Blend Portfolio |
| Class Name | Class 1 |
| Trading Symbol | JLKZX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2055 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/underlying-funds |
| Additional Information Phone Number | 800-344-1029 |
| Additional Information Website | jhinvestments.com/underlying-funds |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2055 Lifetime Blend Portfolio $ 0.05 % |
| Expenses Paid, Amount | $ 6 |
| Expense Ratio, Percent | 0.05% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2055 Lifetime Blend Portfolio (Class 1/JLKZX) returned 21.41% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution U.S. large cap funds were the top contributors in equities TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Defensive equities The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2055 Lifetime Blend Portfolio (Class 1/JLKZX) 21.41 % 10.88 % 8.51 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2055 Index 21.05 % 11.14 % 8.71 % John Hancock 2055 Lifetime Index 21.69 % 11.51 % 9.32 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 431,136,363 |
| Holdings Count | Holding | 24 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 21% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 57.4 % Equity 55.1 % Fixed income 2.3 % Unaffiliated investment companies 41.2 % Equity 41.2 % U.S. Government and Agency obligations 1.3 % U.S. Government 1.3 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000228341 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2055 Lifetime Blend Portfolio |
| Class Name | Class A |
| Trading Symbol | JHBJX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2055 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2055 Lifetime Blend Portfolio $ 0.42 % |
| Expenses Paid, Amount | $ 46 |
| Expense Ratio, Percent | 0.42% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2055 Lifetime Blend Portfolio (Class A/JHBJX) returned 20.92% (excluding sales charges) for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution U.S. large cap funds were the top contributors in equities TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Defensive equities The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2055 Lifetime Blend Portfolio (Class A/JHBJX) 14.86 % 9.51 % 7.84 % 2055 Lifetime Blend Portfolio (Class A/JHBJX)—excluding sales charge 20.92 % 10.63 % 8.39 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2055 Index 21.05 % 11.14 % 8.71 % John Hancock 2055 Lifetime Index 21.69 % 11.51 % 9.32 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 431,136,363 |
| Holdings Count | Holding | 24 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 21% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 57.4 % Equity 55.1 % Fixed income 2.3 % Unaffiliated investment companies 41.2 % Equity 41.2 % U.S. Government and Agency obligations 1.3 % U.S. Government 1.3 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000138485 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2055 Lifetime Blend Portfolio |
| Class Name | Class R4 |
| Trading Symbol | JLKWX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2055 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2055 Lifetime Blend Portfolio $ 0.25 % |
| Expenses Paid, Amount | $ 28 |
| Expense Ratio, Percent | 0.25% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2055 Lifetime Blend Portfolio (Class R4/JLKWX) returned 21.13% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution U.S. large cap funds were the top contributors in equities TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Defensive equities The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2055 Lifetime Blend Portfolio (Class R4/JLKWX) 21.13 % 10.67 % 8.35 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2055 Index 21.05 % 11.14 % 8.71 % John Hancock 2055 Lifetime Index 21.69 % 11.51 % 9.32 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 431,136,363 |
| Holdings Count | Holding | 24 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 21% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 57.4 % Equity 55.1 % Fixed income 2.3 % Unaffiliated investment companies 41.2 % Equity 41.2 % U.S. Government and Agency obligations 1.3 % U.S. Government 1.3 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000138487 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2055 Lifetime Blend Portfolio |
| Class Name | Class R6 |
| Trading Symbol | JLKYX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2055 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2055 Lifetime Blend Portfolio $ 0.01 % |
| Expenses Paid, Amount | $ 1 |
| Expense Ratio, Percent | 0.01% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2055 Lifetime Blend Portfolio (Class R6/JLKYX) returned 21.47% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution U.S. large cap funds were the top contributors in equities TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Defensive equities The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $1,000,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $1,000,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2055 Lifetime Blend Portfolio (Class R6/JLKYX) 21.47 % 10.94 % 8.56 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2055 Index 21.05 % 11.14 % 8.71 % John Hancock 2055 Lifetime Index 21.69 % 11.51 % 9.32 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 431,136,363 |
| Holdings Count | Holding | 24 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 21% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 57.4 % Equity 55.1 % Fixed income 2.3 % Unaffiliated investment companies 41.2 % Equity 41.2 % U.S. Government and Agency obligations 1.3 % U.S. Government 1.3 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132751 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2020 Lifetime Blend Portfolio |
| Class Name | Class 1 |
| Trading Symbol | JRLOX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2020 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/underlying-funds |
| Additional Information Phone Number | 800-344-1029 |
| Additional Information Website | jhinvestments.com/underlying-funds |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2020 Lifetime Blend Portfolio $ 0.19 % |
| Expenses Paid, Amount | $ 20 |
| Expense Ratio, Percent | 0.19% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2020 Lifetime Blend Portfolio (Class 1/JRLOX) returned 13.63% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2020 Lifetime Blend Portfolio (Class 1/JRLOX) 13.63 % 5.86 % ) 5.47 % Bloomberg U.S. Aggregate Bond Index 7.30 % (0.04 ) % 1.64 % S&P Target Date 2020 Index 13.74 % 6.01 % ) 5.54 % John Hancock 2020 Lifetime Index 13.79 % 6.15 % ) 6.05 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 296,616,706 |
| Holdings Count | Holding | 36 |
| Advisory Fees Paid, Amount | $ 116,971 |
| Investment Company Portfolio Turnover | 59% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 45.7 % Fixed income 23.8 % Equity 21.9 % Unaffiliated investment companies 47.2 % Fixed income 23.7 % Equity 23.5 % U.S. Government and Agency obligations 7.0 % U.S. Government 7.0 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000228332 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2020 Lifetime Blend Portfolio |
| Class Name | Class A |
| Trading Symbol | JHAPX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2020 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2020 Lifetime Blend Portfolio $ 0.55 % |
| Expenses Paid, Amount | $ 59 |
| Expense Ratio, Percent | 0.55% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2020 Lifetime Blend Portfolio (Class A/JHAPX) returned 13.23% (excluding sales charges) for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2020 Lifetime Blend Portfolio (Class A/JHAPX) 7.62 % 4.55 % ) 4.82 % 2020 Lifetime Blend Portfolio (Class A/JHAPX)—excluding sales charge 13.23 % 5.63 % ) 5.36 % Bloomberg U.S. Aggregate Bond Index 7.30 % (0.04 ) % 1.64 % S&P Target Date 2020 Index 13.74 % 6.01 % ) 5.54 % John Hancock 2020 Lifetime Index 13.79 % 6.15 % ) 6.05 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 296,616,706 |
| Holdings Count | Holding | 36 |
| Advisory Fees Paid, Amount | $ 116,971 |
| Investment Company Portfolio Turnover | 59% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 45.7 % Fixed income 23.8 % Equity 21.9 % Unaffiliated investment companies 47.2 % Fixed income 23.7 % Equity 23.5 % U.S. Government and Agency obligations 7.0 % U.S. Government 7.0 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132756 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2020 Lifetime Blend Portfolio |
| Class Name | Class R4 |
| Trading Symbol | JRLPX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2020 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2020 Lifetime Blend Portfolio $ 0.39 % |
| Expenses Paid, Amount | $ 42 |
| Expense Ratio, Percent | 0.39% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2020 Lifetime Blend Portfolio (Class R4/JRLPX) returned 13.32% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2020 Lifetime Blend Portfolio (Class R4/JRLPX) 13.32 % 5.63 % ) 5.30 % Bloomberg U.S. Aggregate Bond Index 7.30 % (0.04 ) % 1.64 % S&P Target Date 2020 Index 13.74 % 6.01 % ) 5.54 % John Hancock 2020 Lifetime Index 13.79 % 6.15 % ) 6.05 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 296,616,706 |
| Holdings Count | Holding | 36 |
| Advisory Fees Paid, Amount | $ 116,971 |
| Investment Company Portfolio Turnover | 59% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 45.7 % Fixed income 23.8 % Equity 21.9 % Unaffiliated investment companies 47.2 % Fixed income 23.7 % Equity 23.5 % U.S. Government and Agency obligations 7.0 % U.S. Government 7.0 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132758 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2020 Lifetime Blend Portfolio |
| Class Name | Class R6 |
| Trading Symbol | JRTAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2020 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2020 Lifetime Blend Portfolio $ 0.14 % |
| Expenses Paid, Amount | $ 15 |
| Expense Ratio, Percent | 0.14% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2020 Lifetime Blend Portfolio (Class R6/JRTAX) returned 13.65% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $1,000,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $1,000,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2020 Lifetime Blend Portfolio (Class R6/JRTAX) 13.65 % 5.92 % ) 5.53 % Bloomberg U.S. Aggregate Bond Index 7.30 % (0.04 ) % 1.64 % S&P Target Date 2020 Index 13.74 % 6.01 % ) 5.54 % John Hancock 2020 Lifetime Index 13.79 % 6.15 % ) 6.05 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 296,616,706 |
| Holdings Count | Holding | 36 |
| Advisory Fees Paid, Amount | $ 116,971 |
| Investment Company Portfolio Turnover | 59% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 45.7 % Fixed income 23.8 % Equity 21.9 % Unaffiliated investment companies 47.2 % Fixed income 23.7 % Equity 23.5 % U.S. Government and Agency obligations 7.0 % U.S. Government 7.0 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132775 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2035 Lifetime Blend Portfolio |
| Class Name | Class 1 |
| Trading Symbol | JRTKX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2035 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/underlying-funds |
| Additional Information Phone Number | 800-344-1029 |
| Additional Information Website | jhinvestments.com/underlying-funds |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2035 Lifetime Blend Portfolio $ 0.07 % |
| Expenses Paid, Amount | $ 8 |
| Expense Ratio, Percent | 0.07% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2035 Lifetime Blend Portfolio (Class 1/JRTKX) returned 18.03% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2035 Lifetime Blend Portfolio (Class 1/JRTKX) 18.03 % 9.09 % 7.51 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2035 Index 17.85 % 9.22 % 7.55 % John Hancock 2035 Lifetime Index 18.31 % 9.44 % 8.26 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 891,906,521 |
| Holdings Count | Holding | 32 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 31% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 55.2 % Equity 42.1 % Fixed income 13.1 % Unaffiliated investment companies 41.1 % Equity 33.2 % Fixed income 7.9 % U.S. Government and Agency obligations 3.6 % U.S. Government 3.6 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000228335 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2035 Lifetime Blend Portfolio |
| Class Name | Class A |
| Trading Symbol | JHAYX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2035 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2035 Lifetime Blend Portfolio $ 0.44 % |
| Expenses Paid, Amount | $ 48 |
| Expense Ratio, Percent | 0.44% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2035 Lifetime Blend Portfolio (Class A/JHAYX) returned 17.64% (excluding sales charges) for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2035 Lifetime Blend Portfolio (Class A/JHAYX) 11.71 % 7.73 % 6.84 % 2035 Lifetime Blend Portfolio (Class A/JHAYX)—excluding sales charge 17.64 % 8.84 % 7.39 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2035 Index 17.85 % 9.22 % 7.55 % John Hancock 2035 Lifetime Index 18.31 % 9.44 % 8.26 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 891,906,521 |
| Holdings Count | Holding | 32 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 31% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 55.2 % Equity 42.1 % Fixed income 13.1 % Unaffiliated investment companies 41.1 % Equity 33.2 % Fixed income 7.9 % U.S. Government and Agency obligations 3.6 % U.S. Government 3.6 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132780 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2035 Lifetime Blend Portfolio |
| Class Name | Class R4 |
| Trading Symbol | JRTMX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2035 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2035 Lifetime Blend Portfolio $ 0.28 % |
| Expenses Paid, Amount | $ 31 |
| Expense Ratio, Percent | 0.28% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2035 Lifetime Blend Portfolio (Class R4/JRTMX) returned 17.92% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2035 Lifetime Blend Portfolio (Class R4/JRTMX) 17.92 % 8.87 % 7.36 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2035 Index 17.85 % 9.22 % 7.55 % John Hancock 2035 Lifetime Index 18.31 % 9.44 % 8.26 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 891,906,521 |
| Holdings Count | Holding | 32 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 31% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 55.2 % Equity 42.1 % Fixed income 13.1 % Unaffiliated investment companies 41.1 % Equity 33.2 % Fixed income 7.9 % U.S. Government and Agency obligations 3.6 % U.S. Government 3.6 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132782 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2035 Lifetime Blend Portfolio |
| Class Name | Class R6 |
| Trading Symbol | JRTNX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2035 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2035 Lifetime Blend Portfolio $ 0.03 % |
| Expenses Paid, Amount | $ 3 |
| Expense Ratio, Percent | 0.03% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2035 Lifetime Blend Portfolio (Class R6/JRTNX) returned 18.18% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $1,000,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $1,000,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2035 Lifetime Blend Portfolio (Class R6/JRTNX) 18.18 % 9.14 % 7.57 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2035 Index 17.85 % 9.22 % 7.55 % John Hancock 2035 Lifetime Index 18.31 % 9.44 % 8.26 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 891,906,521 |
| Holdings Count | Holding | 32 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 31% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 55.2 % Equity 42.1 % Fixed income 13.1 % Unaffiliated investment companies 41.1 % Equity 33.2 % Fixed income 7.9 % U.S. Government and Agency obligations 3.6 % U.S. Government 3.6 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132799 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2050 Lifetime Blend Portfolio |
| Class Name | Class 1 |
| Trading Symbol | JRLWX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2050 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/underlying-funds |
| Additional Information Phone Number | 800-344-1029 |
| Additional Information Website | jhinvestments.com/underlying-funds |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2050 Lifetime Blend Portfolio $ 0.05 % |
| Expenses Paid, Amount | $ 6 |
| Expense Ratio, Percent | 0.05% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2050 Lifetime Blend Portfolio (Class 1/JRLWX) returned 21.28% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution U.S. large cap funds were the top contributors in equities TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Defensive equities The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2050 Lifetime Blend Portfolio (Class 1/JRLWX) 21.28 % 10.89 % 8.51 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2050 Index 20.97 % 11.06 % 8.64 % John Hancock 2050 Lifetime Index 21.69 % 11.51 % 9.32 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 551,946,880 |
| Holdings Count | Holding | 24 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 20% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 57.4 % Equity 55.1 % Fixed income 2.3 % Unaffiliated investment companies 41.3 % Equity 41.3 % U.S. Government and Agency obligations 1.3 % U.S. Government 1.3 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000228338 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2050 Lifetime Blend Portfolio |
| Class Name | Class A |
| Trading Symbol | JHBFX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2050 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2050 Lifetime Blend Portfolio $ 0.42 % |
| Expenses Paid, Amount | $ 46 |
| Expense Ratio, Percent | 0.42% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2050 Lifetime Blend Portfolio (Class A/JHBFX) returned 20.87% (excluding sales charges) for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution U.S. large cap funds were the top contributors in equities TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Defensive equities The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2050 Lifetime Blend Portfolio (Class A/JHBFX) 14.80 % 9.52 % 7.84 % 2050 Lifetime Blend Portfolio (Class A/JHBFX)—excluding sales charge 20.87 % 10.64 % 8.39 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2050 Index 20.97 % 11.06 % 8.64 % John Hancock 2050 Lifetime Index 21.69 % 11.51 % 9.32 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 551,946,880 |
| Holdings Count | Holding | 24 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 20% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 57.4 % Equity 55.1 % Fixed income 2.3 % Unaffiliated investment companies 41.3 % Equity 41.3 % U.S. Government and Agency obligations 1.3 % U.S. Government 1.3 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132804 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2050 Lifetime Blend Portfolio |
| Class Name | Class R4 |
| Trading Symbol | JRTYX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2050 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2050 Lifetime Blend Portfolio $ 0.25 % |
| Expenses Paid, Amount | $ 28 |
| Expense Ratio, Percent | 0.25% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2050 Lifetime Blend Portfolio (Class R4/JRTYX) returned 21.16% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution U.S. large cap funds were the top contributors in equities TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Defensive equities The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2050 Lifetime Blend Portfolio (Class R4/JRTYX) 21.16 % 10.68 % 8.35 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2050 Index 20.97 % 11.06 % 8.64 % John Hancock 2050 Lifetime Index 21.69 % 11.51 % 9.32 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 551,946,880 |
| Holdings Count | Holding | 24 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 20% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 57.4 % Equity 55.1 % Fixed income 2.3 % Unaffiliated investment companies 41.3 % Equity 41.3 % U.S. Government and Agency obligations 1.3 % U.S. Government 1.3 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132806 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2050 Lifetime Blend Portfolio |
| Class Name | Class R6 |
| Trading Symbol | JRLZX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2050 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2050 Lifetime Blend Portfolio $ 0.01 % |
| Expenses Paid, Amount | $ 1 |
| Expense Ratio, Percent | 0.01% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2050 Lifetime Blend Portfolio (Class R6/JRLZX) returned 21.44% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution U.S. large cap funds were the top contributors in equities TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Defensive equities The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $1,000,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $1,000,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2050 Lifetime Blend Portfolio (Class R6/JRLZX) 21.44 % 10.92 % 8.57 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2050 Index 20.97 % 11.06 % 8.64 % John Hancock 2050 Lifetime Index 21.69 % 11.51 % 9.32 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 551,946,880 |
| Holdings Count | Holding | 24 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 20% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 57.4 % Equity 55.1 % Fixed income 2.3 % Unaffiliated investment companies 41.3 % Equity 41.3 % U.S. Government and Agency obligations 1.3 % U.S. Government 1.3 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132750 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2015 Lifetime Blend Portfolio |
| Class Name | Class 1 |
| Trading Symbol | JRLIX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2015 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/underlying-funds |
| Additional Information Phone Number | 800-344-1029 |
| Additional Information Website | jhinvestments.com/underlying-funds |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2015 Lifetime Blend Portfolio $ 0.20 % |
| Expenses Paid, Amount | $ 21 |
| Expense Ratio, Percent | 0.20% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2015 Lifetime Blend Portfolio (Class 1/JRLIX) returned 12.88% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2015 Lifetime Blend Portfolio (Class 1/JRLIX) 12.88 % 5.26 % ) 5.01 % Bloomberg U.S. Aggregate Bond Index 7.30 % (0.04 ) % 1.64 % S&P Target Date 2015 Index 12.78 % 5.58 % ) 5.16 % John Hancock 2015 Lifetime Index 12.97 % 5.57 % ) 5.41 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 89,010,159 |
| Holdings Count | Holding | 33 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 68% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 44.3 % Fixed income 25.6 % Equity 18.7 % Unaffiliated investment companies 47.8 % Fixed income 27.8 % Equity 20.0 % U.S. Government and Agency obligations 7.9 % U.S. Government 7.9 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000228331 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2015 Lifetime Blend Portfolio |
| Class Name | Class A |
| Trading Symbol | JHAOX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2015 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2015 Lifetime Blend Portfolio $ 0.57 % |
| Expenses Paid, Amount | $ 61 |
| Expense Ratio, Percent | 0.57% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2015 Lifetime Blend Portfolio (Class A/JHAOX) returned 12.50% (excluding sales charges) for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2015 Lifetime Blend Portfolio (Class A/JHAOX) 6.91 % 3.93 % ) 4.35 % 2015 Lifetime Blend Portfolio (Class A/JHAOX)—excluding sales charge 12.50 % 5.00 % ) 4.88 % Bloomberg U.S. Aggregate Bond Index 7.30 % (0.04 ) % 1.64 % S&P Target Date 2015 Index 12.78 % 5.58 % ) 5.16 % John Hancock 2015 Lifetime Index 12.97 % 5.57 % ) 5.41 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 89,010,159 |
| Holdings Count | Holding | 33 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 68% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 44.3 % Fixed income 25.6 % Equity 18.7 % Unaffiliated investment companies 47.8 % Fixed income 27.8 % Equity 20.0 % U.S. Government and Agency obligations 7.9 % U.S. Government 7.9 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132747 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2015 Lifetime Blend Portfolio |
| Class Name | Class R4 |
| Trading Symbol | JRLKX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2015 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2015 Lifetime Blend Portfolio $ 0.40 % |
| Expenses Paid, Amount | $ 43 |
| Expense Ratio, Percent | 0.40% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2015 Lifetime Blend Portfolio (Class R4/JRLKX) returned 12.68% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2015 Lifetime Blend Portfolio (Class R4/JRLKX) 12.68 % 5.02 % ) 4.84 % Bloomberg U.S. Aggregate Bond Index 7.30 % (0.04 ) % 1.64 % S&P Target Date 2015 Index 12.78 % 5.58 % ) 5.16 % John Hancock 2015 Lifetime Index 12.97 % 5.57 % ) 5.41 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 89,010,159 |
| Holdings Count | Holding | 33 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 68% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 44.3 % Fixed income 25.6 % Equity 18.7 % Unaffiliated investment companies 47.8 % Fixed income 27.8 % Equity 20.0 % U.S. Government and Agency obligations 7.9 % U.S. Government 7.9 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132749 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2015 Lifetime Blend Portfolio |
| Class Name | Class R6 |
| Trading Symbol | JRLLX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2015 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2015 Lifetime Blend Portfolio $ 0.16 % |
| Expenses Paid, Amount | $ 17 |
| Expense Ratio, Percent | 0.16% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2015 Lifetime Blend Portfolio (Class R6/JRLLX) returned 12.92% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $1,000,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $1,000,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2015 Lifetime Blend Portfolio (Class R6/JRLLX) 12.92 % 5.30 % ) 5.05 % Bloomberg U.S. Aggregate Bond Index 7.30 % (0.04 ) % 1.64 % S&P Target Date 2015 Index 12.78 % 5.58 % ) 5.16 % John Hancock 2015 Lifetime Index 12.97 % 5.57 % ) 5.41 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 89,010,159 |
| Holdings Count | Holding | 33 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 68% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 44.3 % Fixed income 25.6 % Equity 18.7 % Unaffiliated investment companies 47.8 % Fixed income 27.8 % Equity 20.0 % U.S. Government and Agency obligations 7.9 % U.S. Government 7.9 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132767 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2030 Lifetime Blend Portfolio |
| Class Name | Class 1 |
| Trading Symbol | JRTGX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2030 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/underlying-funds |
| Additional Information Phone Number | 800-344-1029 |
| Additional Information Website | jhinvestments.com/underlying-funds |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2030 Lifetime Blend Portfolio $ 0.09 % |
| Expenses Paid, Amount | $ 10 |
| Expense Ratio, Percent | 0.09% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2030 Lifetime Blend Portfolio (Class 1/JRTGX) returned 16.43% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2030 Lifetime Blend Portfolio (Class 1/JRTGX) 16.43 % 8.02 % 6.89 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2030 Index 16.06 % 8.03 % 6.83 % John Hancock 2030 Lifetime Index 16.69 % 8.33 % 7.61 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 884,212,015 |
| Holdings Count | Holding | 38 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 37% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 53.5 % Equity 37.1 % Fixed income 16.4 % Unaffiliated investment companies 41.2 % Equity 28.0 % Fixed income 13.2 % U.S. Government and Agency obligations 5.2 % U.S. Government 5.2 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000228334 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2030 Lifetime Blend Portfolio |
| Class Name | Class A |
| Trading Symbol | JHAVX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2030 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2030 Lifetime Blend Portfolio $ 0.46 % |
| Expenses Paid, Amount | $ 50 |
| Expense Ratio, Percent | 0.46% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2030 Lifetime Blend Portfolio (Class A/JHAVX) returned 15.93% (excluding sales charges) for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2030 Lifetime Blend Portfolio (Class A/JHAVX) 10.14 % 6.66 % 6.21 % 2030 Lifetime Blend Portfolio (Class A/JHAVX)—excluding sales charge 15.93 % 7.77 % 6.76 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2030 Index 16.06 % 8.03 % 6.83 % John Hancock 2030 Lifetime Index 16.69 % 8.33 % 7.61 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 884,212,015 |
| Holdings Count | Holding | 38 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 37% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 53.5 % Equity 37.1 % Fixed income 16.4 % Unaffiliated investment companies 41.2 % Equity 28.0 % Fixed income 13.2 % U.S. Government and Agency obligations 5.2 % U.S. Government 5.2 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132772 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2030 Lifetime Blend Portfolio |
| Class Name | Class R4 |
| Trading Symbol | JRTIX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2030 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2030 Lifetime Blend Portfolio $ 0.30 % |
| Expenses Paid, Amount | $ 32 |
| Expense Ratio, Percent | 0.30% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2030 Lifetime Blend Portfolio (Class R4/JRTIX) returned 16.21% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2030 Lifetime Blend Portfolio (Class R4/JRTIX) 16.21 % 7.81 % 6.73 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2030 Index 16.06 % 8.03 % 6.83 % John Hancock 2030 Lifetime Index 16.69 % 8.33 % 7.61 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 884,212,015 |
| Holdings Count | Holding | 38 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 37% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 53.5 % Equity 37.1 % Fixed income 16.4 % Unaffiliated investment companies 41.2 % Equity 28.0 % Fixed income 13.2 % U.S. Government and Agency obligations 5.2 % U.S. Government 5.2 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132774 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2030 Lifetime Blend Portfolio |
| Class Name | Class R6 |
| Trading Symbol | JRTJX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2030 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2030 Lifetime Blend Portfolio $ 0.05 % |
| Expenses Paid, Amount | $ 5 |
| Expense Ratio, Percent | 0.05% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2030 Lifetime Blend Portfolio (Class R6/JRTJX) returned 16.45% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $1,000,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $1,000,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2030 Lifetime Blend Portfolio (Class R6/JRTJX) 16.45 % 8.06 % 6.94 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2030 Index 16.06 % 8.03 % 6.83 % John Hancock 2030 Lifetime Index 16.69 % 8.33 % 7.61 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 884,212,015 |
| Holdings Count | Holding | 38 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 37% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 53.5 % Equity 37.1 % Fixed income 16.4 % Unaffiliated investment companies 41.2 % Equity 28.0 % Fixed income 13.2 % U.S. Government and Agency obligations 5.2 % U.S. Government 5.2 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132791 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2045 Lifetime Blend Portfolio |
| Class Name | Class 1 |
| Trading Symbol | JRLQX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2045 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/underlying-funds |
| Additional Information Phone Number | 800-344-1029 |
| Additional Information Website | jhinvestments.com/underlying-funds |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2045 Lifetime Blend Portfolio $ 0.05 % |
| Expenses Paid, Amount | $ 6 |
| Expense Ratio, Percent | 0.05% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2045 Lifetime Blend Portfolio (Class 1/JRLQX) returned 20.73% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2045 Lifetime Blend Portfolio (Class 1/JRLQX) 20.73 % 10.72 % 8.41 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2045 Index 20.39 % 10.75 % 8.44 % John Hancock 2045 Lifetime Index 21.05 % 11.32 % 9.22 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 668,037,884 |
| Holdings Count | Holding | 30 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 22% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 56.7 % Equity 52.9 % Fixed income 3.8 % Unaffiliated investment companies 41.0 % Equity 39.0 % Fixed income 2.0 % U.S. Government and Agency obligations 2.2 % U.S. Government 2.2 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000228337 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2045 Lifetime Blend Portfolio |
| Class Name | Class A |
| Trading Symbol | JHBEX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2045 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2045 Lifetime Blend Portfolio $ 0.42 % |
| Expenses Paid, Amount | $ 46 |
| Expense Ratio, Percent | 0.42% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2045 Lifetime Blend Portfolio (Class A/JHBEX) returned 20.23% (excluding sales charges) for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2045 Lifetime Blend Portfolio (Class A/JHBEX) 14.24 % 9.33 % 7.74 % 2045 Lifetime Blend Portfolio (Class A/JHBEX)—excluding sales charge 20.23 % 10.46 % 8.29 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2045 Index 20.39 % 10.75 % 8.44 % John Hancock 2045 Lifetime Index 21.05 % 11.32 % 9.22 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 668,037,884 |
| Holdings Count | Holding | 30 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 22% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 56.7 % Equity 52.9 % Fixed income 3.8 % Unaffiliated investment companies 41.0 % Equity 39.0 % Fixed income 2.0 % U.S. Government and Agency obligations 2.2 % U.S. Government 2.2 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132796 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2045 Lifetime Blend Portfolio |
| Class Name | Class R4 |
| Trading Symbol | JRLUX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2045 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2045 Lifetime Blend Portfolio $ 0.25 % |
| Expenses Paid, Amount | $ 28 |
| Expense Ratio, Percent | 0.25% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2045 Lifetime Blend Portfolio (Class R4/JRLUX) returned 20.38% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2045 Lifetime Blend Portfolio (Class R4/JRLUX) 20.38 % 10.47 % 8.24 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2045 Index 20.39 % 10.75 % 8.44 % John Hancock 2045 Lifetime Index 21.05 % 11.32 % 9.22 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 668,037,884 |
| Holdings Count | Holding | 30 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 22% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 56.7 % Equity 52.9 % Fixed income 3.8 % Unaffiliated investment companies 41.0 % Equity 39.0 % Fixed income 2.0 % U.S. Government and Agency obligations 2.2 % U.S. Government 2.2 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000132798 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2045 Lifetime Blend Portfolio |
| Class Name | Class R6 |
| Trading Symbol | JRLVX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2045 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2045 Lifetime Blend Portfolio $ 0.01 % |
| Expenses Paid, Amount | $ 1 |
| Expense Ratio, Percent | 0.01% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2045 Lifetime Blend Portfolio (Class R6/JRLVX) returned 20.75% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution Fixed income allocation also contributed TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Local-currency emerging-market debt The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $1,000,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $1,000,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years 2045 Lifetime Blend Portfolio (Class R6/JRLVX) 20.75 % 10.76 % 8.46 % S&P 500 Index 27.14 % 15.92 % 12.98 % S&P Target Date 2045 Index 20.39 % 10.75 % 8.44 % John Hancock 2045 Lifetime Index 21.05 % 11.32 % 9.22 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 668,037,884 |
| Holdings Count | Holding | 30 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 22% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 56.7 % Equity 52.9 % Fixed income 3.8 % Unaffiliated investment companies 41.0 % Equity 39.0 % Fixed income 2.0 % U.S. Government and Agency obligations 2.2 % U.S. Government 2.2 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000167628 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2060 Lifetime Blend Portfolio |
| Class Name | Class 1 |
| Trading Symbol | JRODX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2060 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/underlying-funds |
| Additional Information Phone Number | 800-344-1029 |
| Additional Information Website | jhinvestments.com/underlying-funds |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2060 Lifetime Blend Portfolio $ 0.05 % |
| Expenses Paid, Amount | $ 6 |
| Expense Ratio, Percent | 0.05% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2060 Lifetime Blend Portfolio (Class 1/JRODX) returned 21.35% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution U.S. large cap funds were the top contributors in equities TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Defensive equities The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years Since inception 2060 Lifetime Blend Portfolio (Class 1/JRODX) 21.35 % 10.87 % 10.31 % S&P 500 Index 27.14 % 15.92 % 14.79 % S&P Target Date 2060+ Index 21.09 % 11.18 % 10.58 % John Hancock 2060 Lifetime Index 21.69 % 11.51 % 11.38 % |
| Performance Inception Date | Mar. 30, 2016 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 244,853,093 |
| Holdings Count | Holding | 24 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 21% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 57.4 % Equity 55.1 % Fixed income 2.3 % Unaffiliated investment companies 41.2 % Equity 41.2 % U.S. Government and Agency obligations 1.3 % U.S. Government 1.3 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000228344 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2060 Lifetime Blend Portfolio |
| Class Name | Class A |
| Trading Symbol | JHBKX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2060 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2060 Lifetime Blend Portfolio $ 0.42 % |
| Expenses Paid, Amount | $ 46 |
| Expense Ratio, Percent | 0.42% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2060 Lifetime Blend Portfolio (Class A/JHBKX) returned 20.96% (excluding sales charges) for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution U.S. large cap funds were the top contributors in equities TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Defensive equities The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years Since inception 2060 Lifetime Blend Portfolio (Class A/JHBKX) 14.91 % 9.50 % 9.49 % 2060 Lifetime Blend Portfolio (Class A/JHBKX)—excluding sales charge 20.96 % 10.62 % 10.17 % S&P 500 Index 27.14 % 15.92 % 14.79 % S&P Target Date 2060+ Index 21.09 % 11.18 % 10.58 % John Hancock 2060 Lifetime Index 21.69 % 11.51 % 11.38 % |
| Performance Inception Date | Mar. 30, 2016 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 244,853,093 |
| Holdings Count | Holding | 24 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 21% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 57.4 % Equity 55.1 % Fixed income 2.3 % Unaffiliated investment companies 41.2 % Equity 41.2 % U.S. Government and Agency obligations 1.3 % U.S. Government 1.3 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000167633 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2060 Lifetime Blend Portfolio |
| Class Name | Class R4 |
| Trading Symbol | JHIKX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2060 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2060 Lifetime Blend Portfolio $ 0.25 % |
| Expenses Paid, Amount | $ 28 |
| Expense Ratio, Percent | 0.25% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2060 Lifetime Blend Portfolio (Class R4/JHIKX) returned 21.14% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution U.S. large cap funds were the top contributors in equities TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Defensive equities The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $10,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years Since inception 2060 Lifetime Blend Portfolio (Class R4/JHIKX) 21.14 % 10.67 % 10.16 % S&P 500 Index 27.14 % 15.92 % 14.79 % S&P Target Date 2060+ Index 21.09 % 11.18 % 10.58 % John Hancock 2060 Lifetime Index 21.69 % 11.51 % 11.38 % |
| Performance Inception Date | Mar. 30, 2016 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 244,853,093 |
| Holdings Count | Holding | 24 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 21% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 57.4 % Equity 55.1 % Fixed income 2.3 % Unaffiliated investment companies 41.2 % Equity 41.2 % U.S. Government and Agency obligations 1.3 % U.S. Government 1.3 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| C000167635 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | 2060 Lifetime Blend Portfolio |
| Class Name | Class R6 |
| Trading Symbol | JIEHX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the John Hancock 2060 Lifetime Blend Portfolio (the fund) for the period of September 1, 2023 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last year? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage 2060 Lifetime Blend Portfolio $ 0.01 % |
| Expenses Paid, Amount | $ 1 |
| Expense Ratio, Percent | 0.01% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS 2060 Lifetime Blend Portfolio (Class R6/JIEHX) returned 21.40% for the year ended August 31, 2024. Stocks rallied as falling inflation raised hopes that the U.S. Federal Reserve would start cutting interest rates. Positive global growth, steady corporate earnings, and excitement surrounding the adoption of AI added to the upbeat tone. In this environment, U.S. equities, the growth style, and the information technology sector outpaced the market as a whole. Bonds also produced gains, with income accounting for the majority of the category’s total return. Credit-oriented categories generally outperformed those with higher interest-rate sensitivity. TOP PERFORMANCE CONTRIBUTORS The equity allocation made the largest contribution U.S. large cap funds were the top contributors in equities TOP PERFORMANCE DETRACTORS U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) Defensive equities The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | Fund Performance The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $1,000,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period. GROWTH OF $1,000,000 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years Since inception 2060 Lifetime Blend Portfolio (Class R6/JIEHX) 21.40 % 10.93 % 10.36 % S&P 500 Index 27.14 % 15.92 % 14.79 % S&P Target Date 2060+ Index 21.09 % 11.18 % 10.58 % John Hancock 2060 Lifetime Index 21.69 % 11.51 % 11.38 % |
| Performance Inception Date | Mar. 30, 2016 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Updated Performance Information Location [Text Block] | Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments |
| Net Assets | $ 244,853,093 |
| Holdings Count | Holding | 24 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 21% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ % Total number of portfolio holdings $ % Total advisory fees paid (net) $ % Portfolio turnover rate $ % |
| Holdings [Text Block] | Graphical Representation of Holdings The table below shows the investment makeup of the fund, representing percentage of the total net assets of the fund. Asset Allocation Affiliated investment companies 57.4 % Equity 55.1 % Fixed income 2.3 % Unaffiliated investment companies 41.2 % Equity 41.2 % U.S. Government and Agency obligations 1.3 % U.S. Government 1.3 % Short-term investments and other 0.1 % Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | 47 Months Ended | 60 Months Ended | 101 Months Ended | 120 Months Ended | ||||||||||||
| Aug. 31, 2024 | Aug. 31, 2024 | Aug. 31, 2024 | Aug. 31, 2024 | Aug. 31, 2024 | Aug. 31, 2023 | Aug. 31, 2022 | Aug. 31, 2021 | Sep. 23, 2020 | Aug. 31, 2020 | Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017 | Aug. 31, 2016 | Mar. 30, 2016 | Aug. 31, 2015 | Aug. 31, 2014 | |
| C000221529 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2065 Lifetime Blend Portfolio (Class 1/JAAFX) | ||||||||||||||||
| Account Value | $ 15,496.99283 | $ 15,496.99283 | $ 15,496.99283 | $ 15,496.99283 | $ 15,496.99283 | $ 12,765.867376 | $ 11,530.202445 | $ 13,641.5752 | $ 10,000 | ||||||||
| Average Annual Return, Percent | 21.39% | 11.76% | |||||||||||||||
| C000228345 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2065 Lifetime Blend Portfolio (Class A/JHBLX) | ||||||||||||||||
| Account Value | $ 14,544.641211 | $ 14,544.641211 | 14,544.641211 | 14,544.641211 | 14,544.641211 | 12,028.712763 | 10,903.81472 | 12,959.49644 | 9,500 | ||||||||
| Average Annual Return, Percent | 14.87% | 9.97% | |||||||||||||||
| C000228345 [Member] | Without Sales Load [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2065 Lifetime Blend Portfolio (Class A/JHBLX)—excluding sales charge | ||||||||||||||||
| Average Annual Return, Percent | 20.92% | 11.42% | |||||||||||||||
| C000221527 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2065 Lifetime Blend Portfolio (Class R4/JAAJX) | ||||||||||||||||
| Account Value | $ 15,393.440538 | $ 15,393.440538 | 15,393.440538 | 15,393.440538 | 15,393.440538 | 12,703.068046 | 11,494.312053 | 13,628.4827 | 10,000 | ||||||||
| Average Annual Return, Percent | 21.18% | 11.57% | |||||||||||||||
| C000221528 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2065 Lifetime Blend Portfolio (Class R6/JAAKX) | ||||||||||||||||
| Account Value | $ 1,550,918.493466 | $ 1,550,918.493466 | 1,550,918.493466 | 1,550,918.493466 | 1,550,918.493466 | 1,276,940.690996 | 1,152,631.244013 | 1,364,370.8 | 1,000,000 | ||||||||
| Average Annual Return, Percent | 21.46% | 11.78% | |||||||||||||||
| C000132735 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2010 Lifetime Blend Portfolio (Class 1/JRLDX) | ||||||||||||||||
| Account Value | $ 15,767.281484 | $ 15,767.281484 | $ 15,767.281484 | 15,767.281484 | $ 15,767.281484 | 14,082.100839 | 13,485.291981 | 15,047.519429 | $ 13,491.526802 | $ 12,487.852266 | $ 11,775.035869 | $ 11,303.579506 | $ 10,580.419473 | $ 9,764.0945 | $ 10,000 | ||
| Average Annual Return, Percent | 11.97% | 4.77% | 4.66% | ||||||||||||||
| C000228330 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2010 Lifetime Blend Portfolio (Class A/JHANX) | ||||||||||||||||
| Account Value | $ 14,812.111674 | 14,812.111674 | $ 14,812.111674 | 14,812.111674 | $ 14,812.111674 | 13,275.790589 | 12,762.731096 | 14,295.143457 | 12,816.950462 | 11,863.459652 | 11,186.284075 | 10,738.40053 | 10,051.398499 | 9,275.889775 | 9,500 | ||
| Average Annual Return, Percent | 6.02% | 3.48% | 4.01% | ||||||||||||||
| C000228330 [Member] | Without Sales Load [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2010 Lifetime Blend Portfolio (Class A/JHANX)—excluding sales charge | ||||||||||||||||
| Average Annual Return, Percent | 11.57% | 4.54% | 4.54% | ||||||||||||||
| C000132740 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2010 Lifetime Blend Portfolio (Class R4/JRLFX) | ||||||||||||||||
| Account Value | $ 15,555.017582 | 15,555.017582 | $ 15,555.017582 | 15,555.017582 | $ 15,555.017582 | 13,905.285723 | 13,345.863045 | 14,924.61009 | 13,402.260338 | 12,418.263698 | 11,725.65339 | 11,278.198641 | 10,556.66238 | 9,754.2936 | 10,000 | ||
| Average Annual Return, Percent | 11.86% | 4.61% | 4.52% | ||||||||||||||
| C000132742 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2010 Lifetime Blend Portfolio (Class R6/JRLHX) | ||||||||||||||||
| Account Value | $ 1,584,978.955499 | 1,584,978.955499 | $ 1,584,978.955499 | 1,584,978.955499 | $ 1,584,978.955499 | 1,415,211.841274 | 1,354,738.340322 | 1,510,934.722644 | 1,354,222.266661 | 1,252,862.913212 | 1,180,810.294154 | 1,133,033.076576 | 1,059,079.582746 | 977,838.42 | 1,000,000 | ||
| Average Annual Return, Percent | 12% | 4.82% | 4.71% | ||||||||||||||
| C000132759 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2025 Lifetime Blend Portfolio (Class 1/JRTBX) | ||||||||||||||||
| Account Value | $ 18,222.000815 | 18,222.000815 | $ 18,222.000815 | 18,222.000815 | $ 18,222.000815 | 15,893.31126 | 15,072.485409 | 17,345.341813 | 14,599.242417 | 13,042.457633 | 12,664.178864 | 11,744.83924 | 10,533.575305 | 9,675.53919999999 | 10,000 | ||
| Average Annual Return, Percent | 14.65% | 6.92% | 6.18% | ||||||||||||||
| C000228333 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2025 Lifetime Blend Portfolio (Class A/JHAUX) | ||||||||||||||||
| Account Value | $ 17,121.508843 | 17,121.508843 | $ 17,121.508843 | 17,121.508843 | $ 17,121.508843 | 14,985.828125 | 14,265.182489 | 16,465.476837 | 13,869.280295 | 12,390.334751 | 12,030.96992 | 11,157.597278 | 10,006.89654 | 9,191.76224 | 9,500 | ||
| Average Annual Return, Percent | 8.50% | 5.59% | 5.53% | ||||||||||||||
| C000228333 [Member] | Without Sales Load [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2025 Lifetime Blend Portfolio (Class A/JHAUX)—excluding sales charge | ||||||||||||||||
| Average Annual Return, Percent | 14.25% | 6.68% | 6.07% | ||||||||||||||
| C000132764 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2025 Lifetime Blend Portfolio (Class R4/JRTDX) | ||||||||||||||||
| Account Value | $ 17,945.134892 | 17,945.134892 | $ 17,945.134892 | 17,945.134892 | $ 17,945.134892 | 15,696.041562 | 14,903.580199 | 17,189.035968 | 14,505.32573 | 12,981.743175 | 12,611.283445 | 11,708.003918 | 10,500.538868 | 9,656.5161 | 10,000 | ||
| Average Annual Return, Percent | 14.33% | 6.69% | 6.02% | ||||||||||||||
| C000132766 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2025 Lifetime Blend Portfolio (Class R6/JRTFX) | ||||||||||||||||
| Account Value | $ 1,831,869.940027 | 1,831,869.940027 | $ 1,831,869.940027 | 1,831,869.940027 | $ 1,831,869.940027 | 1,597,370.113125 | 1,514,158.402497 | 1,741,608.421861 | 1,465,461.107355 | 1,308,636.456828 | 1,269,932.396983 | 1,176,264.186127 | 1,055,366.336612 | 968,968.36 | 1,000,000 | ||
| Average Annual Return, Percent | 14.68% | 6.96% | 6.24% | ||||||||||||||
| C000132783 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2040 Lifetime Blend Portfolio (Class 1/JRTTX) | ||||||||||||||||
| Account Value | $ 21,843.58945 | 21,843.58945 | $ 21,843.58945 | 21,843.58945 | $ 21,843.58945 | 18,271.462142 | 16,756.438015 | 19,764.719194 | 15,543.438286 | 13,518.465911 | 13,484.310288 | 12,113.219242 | 10,506.878396 | 9,602.4682 | 10,000 | ||
| Average Annual Return, Percent | 19.55% | 10.07% | 8.13% | ||||||||||||||
| C000228336 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2040 Lifetime Blend Portfolio (Class A/JHBAX) | ||||||||||||||||
| Account Value | $ 20,526.840322 | 20,526.840322 | $ 20,526.840322 | 20,526.840322 | $ 20,526.840322 | 17,228.76881 | 15,846.826351 | 18,763.727544 | 14,766.266373 | 12,842.542616 | 12,810.094774 | 11,507.55828 | 9,981.534476 | 9,122.34479 | 9,500 | ||
| Average Annual Return, Percent | 13.17% | 8.70% | 7.46% | ||||||||||||||
| C000228336 [Member] | Without Sales Load [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2040 Lifetime Blend Portfolio (Class A/JHBAX)—excluding sales charge | ||||||||||||||||
| Average Annual Return, Percent | 19.14% | 9.83% | 8.01% | ||||||||||||||
| C000132788 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2040 Lifetime Blend Portfolio (Class R4/JRTVX) | ||||||||||||||||
| Account Value | $ 21,542.041716 | 21,542.041716 | $ 21,542.041716 | 21,542.041716 | $ 21,542.041716 | 18,053.972823 | 16,580.878498 | 19,600.255757 | 15,438.59808 | 13,453.893677 | 13,439.740958 | 12,086.501556 | 10,483.727127 | 9,593.023 | 10,000 | ||
| Average Annual Return, Percent | 19.32% | 9.87% | 7.98% | ||||||||||||||
| C000132790 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2040 Lifetime Blend Portfolio (Class R6/JRTWX) | ||||||||||||||||
| Account Value | $ 2,194,152.11035 | 2,194,152.11035 | $ 2,194,152.11035 | 2,194,152.11035 | $ 2,194,152.11035 | 1,834,892.352974 | 1,680,627.765653 | 1,981,610.596266 | 1,557,756.036338 | 1,353,980.401722 | 1,350,868.43313 | 1,212,007.062885 | 1,051,688.261671 | 960,756.73 | 1,000,000 | ||
| Average Annual Return, Percent | 19.58% | 10.14% | 8.17% | ||||||||||||||
| C000138480 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2055 Lifetime Blend Portfolio (Class 1/JLKZX) | ||||||||||||||||
| Account Value | $ 22,635.280448 | 22,635.280448 | $ 22,635.280448 | 22,635.280448 | $ 22,635.280448 | 18,643.753346 | 16,841.038256 | 19,937.104746 | 15,499.902541 | 13,504.072471 | 13,503.838449 | 12,108.839476 | 10,503.514466 | 9,601.7147 | 10,000 | ||
| Average Annual Return, Percent | 21.41% | 10.88% | 8.51% | ||||||||||||||
| C000228341 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2055 Lifetime Blend Portfolio (Class A/JHBJX) | ||||||||||||||||
| Account Value | $ 21,257.236727 | 21,257.236727 | $ 21,257.236727 | 21,257.236727 | $ 21,257.236727 | 17,580.14757 | 15,940.604148 | 18,927.672964 | 14,724.907413 | 12,828.868847 | 12,828.646527 | 11,503.397503 | 9,978.338743 | 9,121.628965 | 9,500 | ||
| Average Annual Return, Percent | 14.86% | 9.51% | 7.84% | ||||||||||||||
| C000228341 [Member] | Without Sales Load [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2055 Lifetime Blend Portfolio (Class A/JHBJX)—excluding sales charge | ||||||||||||||||
| Average Annual Return, Percent | 20.92% | 10.63% | 8.39% | ||||||||||||||
| C000138485 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2055 Lifetime Blend Portfolio (Class R4/JLKWX) | ||||||||||||||||
| Account Value | $ 22,296.4087 | 22,296.4087 | $ 22,296.4087 | 22,296.4087 | $ 22,296.4087 | 18,407.378565 | 16,647.075515 | 19,755.370494 | 15,402.162565 | 13,431.656022 | 13,450.057718 | 12,071.441516 | 10,479.671436 | 9,591.0874 | 10,000 | ||
| Average Annual Return, Percent | 21.13% | 10.67% | 8.35% | ||||||||||||||
| C000138487 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2055 Lifetime Blend Portfolio (Class R6/JLKYX) | ||||||||||||||||
| Account Value | $ 2,274,434.715919 | 2,274,434.715919 | $ 2,274,434.715919 | 2,274,434.715919 | $ 2,274,434.715919 | 1,872,410.520365 | 1,690,318.981156 | 2,000,580.841473 | 1,555,650.646751 | 1,353,332.440668 | 1,352,543.785912 | 1,213,155.135967 | 1,051,747.177718 | 960,946.12 | 1,000,000 | ||
| Average Annual Return, Percent | 21.47% | 10.94% | 8.56% | ||||||||||||||
| C000132751 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2020 Lifetime Blend Portfolio (Class 1/JRLOX) | ||||||||||||||||
| Account Value | $ 17,040.499679 | 17,040.499679 | $ 17,040.499679 | 17,040.499679 | $ 17,040.499679 | 14,996.302674 | 14,310.306369 | 16,253.868922 | 14,088.519297 | 12,816.33782 | 12,291.715716 | 11,565.175979 | 10,545.893346 | 9,708.7733 | 10,000 | ||
| Average Annual Return, Percent | 13.63% | 5.86% | 5.47% | ||||||||||||||
| C000228332 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2020 Lifetime Blend Portfolio (Class A/JHAPX) | ||||||||||||||||
| Account Value | $ 16,012.217176 | 16,012.217176 | $ 16,012.217176 | 16,012.217176 | $ 16,012.217176 | 14,140.763114 | 13,529.878674 | 15,428.732953 | 13,384.093331 | 12,175.520928 | 11,677.129929 | 10,986.917179 | 10,018.598678 | 9,223.334635 | 9,500 | ||
| Average Annual Return, Percent | 7.62% | 4.55% | 4.82% | ||||||||||||||
| C000228332 [Member] | Without Sales Load [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2020 Lifetime Blend Portfolio (Class A/JHAPX)—excluding sales charge | ||||||||||||||||
| Average Annual Return, Percent | 13.23% | 5.63% | 5.36% | ||||||||||||||
| C000132756 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2020 Lifetime Blend Portfolio (Class R4/JRLPX) | ||||||||||||||||
| Account Value | $ 16,753.8862829999 | 16,753.8862829999 | $ 16,753.8862829999 | 16,753.8862829999 | $ 16,753.8862829999 | 14,784.812828 | 14,124.121589 | 16,081.221526 | 13,973.437354 | 12,742.500584 | 12,237.925882 | 11,518.097539 | 10,512.137011 | 9,689.6263 | 10,000 | ||
| Average Annual Return, Percent | 13.32% | 5.63% | 5.30% | ||||||||||||||
| C000132758 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2020 Lifetime Blend Portfolio (Class R6/JRTAX) | ||||||||||||||||
| Account Value | $ 1,712,576.612038 | 1,712,576.612038 | $ 1,712,576.612038 | 1,712,576.612038 | $ 1,712,576.612038 | 1,506,890.675989 | 1,436,016.156048 | 1,630,326.395561 | 1,412,688.606049 | 1,284,636.244997 | 1,231,457.761172 | 1,157,174.060126 | 1,055,614.844366 | 970,432.35 | 1,000,000 | ||
| Average Annual Return, Percent | 13.65% | 5.92% | 5.53% | ||||||||||||||
| C000132775 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2035 Lifetime Blend Portfolio (Class 1/JRTKX) | ||||||||||||||||
| Account Value | $ 20,635.464569 | 20,635.464569 | $ 20,635.464569 | 20,635.464569 | $ 20,635.464569 | 17,483.52239 | 16,197.488906 | 19,048.380374 | 15,279.062415 | 13,356.304336 | 13,239.989965 | 11,986.178084 | 10,478.147302 | 9,591.434 | 10,000 | ||
| Average Annual Return, Percent | 18.03% | 9.09% | 7.51% | ||||||||||||||
| C000228335 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2035 Lifetime Blend Portfolio (Class A/JHAYX) | ||||||||||||||||
| Account Value | $ 19,379.814096 | 19,379.814096 | $ 19,379.814096 | 19,379.814096 | $ 19,379.814096 | 16,474.000137 | 15,318.194422 | 18,083.28023 | 14,515.109294 | 12,688.489119 | 12,577.990467 | 11,386.86918 | 9,954.239937 | 9,111.8623 | 9,500 | ||
| Average Annual Return, Percent | 11.71% | 7.73% | 6.84% | ||||||||||||||
| C000228335 [Member] | Without Sales Load [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2035 Lifetime Blend Portfolio (Class A/JHAYX)—excluding sales charge | ||||||||||||||||
| Average Annual Return, Percent | 17.64% | 8.84% | 7.39% | ||||||||||||||
| C000132780 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2035 Lifetime Blend Portfolio (Class R4/JRTMX) | ||||||||||||||||
| Account Value | $ 20,342.728254 | 20,342.728254 | $ 20,342.728254 | 20,342.728254 | $ 20,342.728254 | 17,251.932569 | 16,032.379147 | 18,894.754366 | 15,179.992394 | 13,298.654718 | 13,203.160614 | 11,964.779277 | 10,459.40968 | 9,586.2466 | 10,000 | ||
| Average Annual Return, Percent | 17.92% | 8.87% | 7.36% | ||||||||||||||
| C000132782 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2035 Lifetime Blend Portfolio (Class R6/JRTNX) | ||||||||||||||||
| Account Value | $ 2,074,380.126268 | 2,074,380.126268 | $ 2,074,380.126268 | 2,074,380.126268 | $ 2,074,380.126268 | 1,755,327.885611 | 1,626,828.493426 | 1,912,367.756674 | 1,533,259.452249 | 1,339,699.553573 | 1,327,304.007451 | 1,201,056.622098 | 1,048,418.486039 | 960,086.54 | 1,000,000 | ||
| Average Annual Return, Percent | 18.18% | 9.14% | 7.57% | ||||||||||||||
| C000132799 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2050 Lifetime Blend Portfolio (Class 1/JRLWX) | ||||||||||||||||
| Account Value | $ 22,634.903536 | 22,634.903536 | $ 22,634.903536 | 22,634.903536 | $ 22,634.903536 | 18,663.795458 | 16,841.289391 | 19,936.018084 | 15,503.804307 | 13,502.43939 | 13,496.01124 | 12,108.128512 | 10,502.305063 | 9,594.2683 | 10,000 | ||
| Average Annual Return, Percent | 21.28% | 10.89% | 8.51% | ||||||||||||||
| C000228338 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2050 Lifetime Blend Portfolio (Class A/JHBFX) | ||||||||||||||||
| Account Value | $ 21,269.709823 | 21,269.709823 | $ 21,269.709823 | 21,269.709823 | $ 21,269.709823 | 17,597.627208 | 15,939.35086 | 18,939.217181 | 14,728.614093 | 12,827.317421 | 12,821.210678 | 11,502.722086 | 9,977.18981 | 9,114.554885 | 9,500 | ||
| Average Annual Return, Percent | 14.80% | 9.52% | 7.84% | ||||||||||||||
| C000228338 [Member] | Without Sales Load [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2050 Lifetime Blend Portfolio (Class A/JHBFX)—excluding sales charge | ||||||||||||||||
| Average Annual Return, Percent | 20.87% | 10.64% | 8.39% | ||||||||||||||
| C000132804 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2050 Lifetime Blend Portfolio (Class R4/JRTYX) | ||||||||||||||||
| Account Value | $ 22,309.013378 | 22,309.013378 | $ 22,309.013378 | 22,309.013378 | $ 22,309.013378 | 18,413.192162 | 16,664.318285 | 19,755.49355 | 15,397.588939 | 13,434.542461 | 13,458.749233 | 12,077.546845 | 10,484.323924 | 9,589.2978 | 10,000 | ||
| Average Annual Return, Percent | 21.16% | 10.68% | 8.35% | ||||||||||||||
| C000132806 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2050 Lifetime Blend Portfolio (Class R6/JRLZX) | ||||||||||||||||
| Account Value | $ 2,274,632.421065 | 2,274,632.421065 | $ 2,274,632.421065 | 2,274,632.421065 | $ 2,274,632.421065 | 1,873,118.279207 | 1,691,921.184726 | 2,000,683.225803 | 1,556,289.056558 | 1,354,560.969375 | 1,353,037.976298 | 1,212,290.992114 | 1,051,810.463677 | 960,384.36 | 1,000,000 | ||
| Average Annual Return, Percent | 21.44% | 10.92% | 8.57% | ||||||||||||||
| C000132750 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2015 Lifetime Blend Portfolio (Class 1/JRLIX) | ||||||||||||||||
| Account Value | $ 16,297.831588 | 16,297.831588 | $ 16,297.831588 | 16,297.831588 | $ 16,297.831588 | 14,437.835169 | 13,788.439385 | 15,527.950247 | 13,718.365703 | 12,613.213819 | 11,974.62571 | 11,390.919674 | 10,548.747935 | 9,725.318 | 10,000 | ||
| Average Annual Return, Percent | 12.88% | 5.26% | 5.01% | ||||||||||||||
| C000228331 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2015 Lifetime Blend Portfolio (Class A/JHAOX) | ||||||||||||||||
| Account Value | $ 15,295.902821 | 15,295.902821 | $ 15,295.902821 | 15,295.902821 | $ 15,295.902821 | 13,596.699612 | 13,036.472961 | 14,739.019559 | 13,032.447417 | 11,982.553127 | 11,375.894424 | 10,821.37369 | 10,021.310538 | 9,239.0521 | 9,500 | ||
| Average Annual Return, Percent | 6.91% | 3.93% | 4.35% | ||||||||||||||
| C000228331 [Member] | Without Sales Load [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2015 Lifetime Blend Portfolio (Class A/JHAOX)—excluding sales charge | ||||||||||||||||
| Average Annual Return, Percent | 12.50% | 5% | 4.88% | ||||||||||||||
| C000132747 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2015 Lifetime Blend Portfolio (Class R4/JRLKX) | ||||||||||||||||
| Account Value | $ 16,041.179664 | 16,041.179664 | $ 16,041.179664 | 16,041.179664 | $ 16,041.179664 | 14,235.839726 | 13,629.562442 | 15,385.346492 | 13,615.435703 | 12,554.232228 | 11,934.01196 | 11,365.023967 | 10,524.766791 | 9,706.0553 | 10,000 | ||
| Average Annual Return, Percent | 12.68% | 5.02% | 4.84% | ||||||||||||||
| C000132749 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2015 Lifetime Blend Portfolio (Class R6/JRLLX) | ||||||||||||||||
| Account Value | $ 1,636,741.461738 | 1,636,741.461738 | $ 1,636,741.461738 | 1,636,741.461738 | $ 1,636,741.461738 | 1,449,406.587875 | 1,385,483.483432 | 1,558,082.117869 | 1,375,898.660734 | 1,264,466.965664 | 1,199,822.918461 | 1,140,795.55541 | 1,055,922.881684 | 973,966.44 | 1,000,000 | ||
| Average Annual Return, Percent | 12.92% | 5.30% | 5.05% | ||||||||||||||
| C000132767 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2030 Lifetime Blend Portfolio (Class 1/JRTGX) | ||||||||||||||||
| Account Value | $ 19,468.697248 | 19,468.697248 | $ 19,468.697248 | 19,468.697248 | $ 19,468.697248 | 16,721.844643 | 15,683.963238 | 18,291.270645 | 15,013.415262 | 13,236.402075 | 12,983.877091 | 11,894.318612 | 10,511.21026 | 9,638.9261 | 10,000 | ||
| Average Annual Return, Percent | 16.43% | 8.02% | 6.89% | ||||||||||||||
| C000228334 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2030 Lifetime Blend Portfolio (Class A/JHAVX) | ||||||||||||||||
| Account Value | $ 18,279.942015 | 18,279.942015 | $ 18,279.942015 | 18,279.942015 | $ 18,279.942015 | 15,767.950866 | 14,831.237074 | 17,364.133504 | 14,262.744498 | 12,574.581971 | 12,334.683237 | 11,299.602682 | 9,985.649747 | 9,156.979795 | 9,500 | ||
| Average Annual Return, Percent | 10.14% | 6.66% | 6.21% | ||||||||||||||
| C000228334 [Member] | Without Sales Load [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2030 Lifetime Blend Portfolio (Class A/JHAVX)—excluding sales charge | ||||||||||||||||
| Average Annual Return, Percent | 15.93% | 7.77% | 6.76% | ||||||||||||||
| C000132772 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2030 Lifetime Blend Portfolio (Class R4/JRTIX) | ||||||||||||||||
| Account Value | $ 19,174.718477 | 19,174.718477 | $ 19,174.718477 | 19,174.718477 | $ 19,174.718477 | 16,499.787313 | 15,511.277924 | 18,129.666418 | 14,904.467281 | 13,166.667676 | 12,934.240919 | 11,863.067929 | 10,483.593503 | 9,624.7486 | 10,000 | ||
| Average Annual Return, Percent | 16.21% | 7.81% | 6.73% | ||||||||||||||
| C000132774 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2030 Lifetime Blend Portfolio (Class R6/JRTJX) | ||||||||||||||||
| Account Value | $ 1,956,393.017609 | 1,956,393.017609 | $ 1,956,393.017609 | 1,956,393.017609 | $ 1,956,393.017609 | 1,679,964.89133 | 1,573,603.282997 | 1,834,587.927237 | 1,505,196.232522 | 1,327,604.936418 | 1,301,486.803367 | 1,190,742.314517 | 1,051,698.274272 | 963,934.09 | 1,000,000 | ||
| Average Annual Return, Percent | 16.45% | 8.06% | 6.94% | ||||||||||||||
| C000132791 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2045 Lifetime Blend Portfolio (Class 1/JRLQX) | ||||||||||||||||
| Account Value | $ 22,432.022166 | 22,432.022166 | $ 22,432.022166 | 22,432.022166 | $ 22,432.022166 | 18,580.929748 | 16,840.987008 | 19,913.925574 | 15,490.014103 | 13,482.883915 | 13,479.017863 | 12,091.773111 | 10,492.982453 | 9,590.8687 | 10,000 | ||
| Average Annual Return, Percent | 20.73% | 10.72% | 8.41% | ||||||||||||||
| C000228337 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2045 Lifetime Blend Portfolio (Class A/JHBEX) | ||||||||||||||||
| Account Value | $ 21,067.338361 | 21,067.338361 | $ 21,067.338361 | 21,067.338361 | $ 21,067.338361 | 17,521.803667 | 15,940.438521 | 18,918.229296 | 14,715.513398 | 12,808.739719 | 12,805.06697 | 11,487.184455 | 9,968.33333 | 9,111.325265 | 9,500 | ||
| Average Annual Return, Percent | 14.24% | 9.33% | 7.74% | ||||||||||||||
| C000228337 [Member] | Without Sales Load [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2045 Lifetime Blend Portfolio (Class A/JHBEX)—excluding sales charge | ||||||||||||||||
| Average Annual Return, Percent | 20.23% | 10.46% | 8.29% | ||||||||||||||
| C000132796 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2045 Lifetime Blend Portfolio (Class R4/JRLUX) | ||||||||||||||||
| Account Value | $ 22,064.876681 | 22,064.876681 | $ 22,064.876681 | 22,064.876681 | $ 22,064.876681 | 18,329.605668 | 16,647.081934 | 19,731.851929 | 15,378.853582 | 13,411.153924 | 13,425.918944 | 12,055.686928 | 10,470.235769 | 9,581.4153 | 10,000 | ||
| Average Annual Return, Percent | 20.38% | 10.47% | 8.24% | ||||||||||||||
| C000132798 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2045 Lifetime Blend Portfolio (Class R6/JRLVX) | ||||||||||||||||
| Account Value | $ 2,252,765.38644 | 2,252,765.38644 | $ 2,252,765.38644 | 2,252,765.38644 | $ 2,252,765.38644 | 1,865,573.5755 | 1,690,194.299357 | 1,997,516.272842 | 1,553,383.466248 | 1,351,524.26244 | 1,350,273.166837 | 1,209,801.472531 | 1,049,343.949219 | 959,582.72 | 1,000,000 | ||
| Average Annual Return, Percent | 20.75% | 10.76% | 8.46% | ||||||||||||||
| C000167628 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2060 Lifetime Blend Portfolio (Class 1/JRODX) | ||||||||||||||||
| Account Value | $ 22,860.591742 | 22,860.591742 | $ 22,860.591742 | $ 22,860.591742 | $ 22,860.591742 | 18,837.928601 | 17,005.459868 | 20,130.15086 | 15,660.252017 | 13,644.759249 | 13,641.105888 | 12,228.05135 | 10,600 | $ 10,000 | |||
| Average Annual Return, Percent | 21.35% | 10.87% | 10.31% | ||||||||||||||
| C000228344 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2060 Lifetime Blend Portfolio (Class A/JHBKX) | ||||||||||||||||
| Account Value | $ 21,473.485435 | 21,473.485435 | $ 21,473.485435 | $ 21,473.485435 | 21,473.485435 | 17,752.64193 | 16,084.490908 | 19,111.802077 | 14,877.239417 | 12,962.521287 | 12,959.050594 | 11,616.648783 | 10,070 | 9,500 | |||
| Average Annual Return, Percent | 14.91% | 9.50% | 9.49% | ||||||||||||||
| C000228344 [Member] | Without Sales Load [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2060 Lifetime Blend Portfolio (Class A/JHBKX)—excluding sales charge | ||||||||||||||||
| Average Annual Return, Percent | 20.96% | 10.62% | 10.17% | ||||||||||||||
| C000167633 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2060 Lifetime Blend Portfolio (Class R4/JHIKX) | ||||||||||||||||
| Account Value | $ 22,594.651036 | 22,594.651036 | $ 22,594.651036 | $ 22,594.651036 | 22,594.651036 | 18,652.314146 | 16,872.974609 | 20,016.240083 | 15,593.095089 | 13,611.036729 | 13,616.480462 | 12,228.013826 | 10,600 | 10,000 | |||
| Average Annual Return, Percent | 21.14% | 10.67% | 10.16% | ||||||||||||||
| C000167635 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 2060 Lifetime Blend Portfolio (Class R6/JIEHX) | ||||||||||||||||
| Account Value | $ 2,294,674.723679 | 2,294,674.723679 | $ 2,294,674.723679 | $ 2,294,674.723679 | 2,294,674.723679 | 1,890,209.632364 | 1,705,350.122478 | 2,019,135.344915 | 1,569,150.325696 | 1,366,383.651223 | 1,365,263.35707 | 1,223,272.4042 | 1,060,000 | 1,000,000 | |||
| Average Annual Return, Percent | 21.40% | 10.93% | 10.36% | ||||||||||||||
| Standard & Poor's 500 Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | ||||||||||||||||
| Account Value | $ 18,102.778593 | $ 18,102.778593 | $ 18,102.778593 | $ 18,102.778593 | $ 18,102.778593 | 14,238.979302 | 12,280.856323 | 13,834.0945 | 10,000 | 18,614.067583 | 15,265.349906 | 14,832.022577 | 12,394.976573 | 10,663.807 | 10,000 | 10,047.7913 | 10,000 |
| Average Annual Return, Percent | 27.14% | 16.26% | 15.92% | 14.79% | 12.98% | ||||||||||||
| Bloomberg U S Aggregate Bond Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index | ||||||||||||||||
| Account Value | $ 11,765.406371 | $ 11,765.406371 | $ 11,765.406371 | $ 11,765.406371 | $ 11,765.406371 | 10,965.301134 | 11,097.722488 | 12,542.057701 | 12,552.641963 | 11,789.468742 | 10,700.908741 | 10,814.374128 | 10,761.416551 | 10,155.4935 | 10,000 | ||
| Average Annual Return, Percent | 7.30% | (0.04%) | 1.64% | ||||||||||||||
| S And P Target Date 2060 Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | S&P Target Date 2060+ Index | ||||||||||||||||
| Account Value | $ 15,640.196519 | $ 15,640.196519 | $ 15,640.196519 | $ 15,640.196519 | $ 15,640.196519 | 12,916.48718 | 11,435.406291 | 13,322.5848 | 10,000 | 15,478.797137 | 13,731.595637 | 13,801.097412 | 12,202.622881 | 10,607.1808 | 10,000 | ||
| Average Annual Return, Percent | 21.09% | 12.02% | 11.18% | 10.58% | |||||||||||||
| John Hancock 2065 Lifetime Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | John Hancock 2065 Lifetime Index | ||||||||||||||||
| Account Value | $ 15,473.336097 | $ 15,473.336097 | $ 15,473.336097 | $ 15,473.336097 | 15,473.336097 | 12,715.392302 | 11,435.081575 | 13,474.154 | $ 10,000 | ||||||||
| Average Annual Return, Percent | 21.69% | 11.72% | |||||||||||||||
| S And P Target Date 2010 Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | S&P Target Date 2010 Index | ||||||||||||||||
| Account Value | $ 15,868.958858 | $ 15,868.958858 | $ 15,868.958858 | 15,868.958858 | $ 15,868.958858 | 14,138.843948 | 13,429.880809 | 14,966.85632 | 13,499.603942 | 12,367.327722 | 11,843.566484 | 11,239.320176 | 10,567.919137 | 9,927.3656 | 10,000 | ||
| Average Annual Return, Percent | 12.24% | 5.11% | 4.73% | ||||||||||||||
| John Hancock 2010 Lifetime Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | John Hancock 2010 Lifetime Index | ||||||||||||||||
| Account Value | $ 16,203.630427 | 16,203.630427 | $ 16,203.630427 | 16,203.630427 | $ 16,203.630427 | 14,449.914656 | 13,826.555332 | 15,341.357607 | 13,684.455259 | 12,656.152605 | 11,911.464183 | 11,347.317432 | 10,618.217029 | 9,735.1487 | 10,000 | ||
| Average Annual Return, Percent | 12.14% | 5.06% | 4.94% | ||||||||||||||
| S And P Target Date 2025 Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | S&P Target Date 2025 Index | ||||||||||||||||
| Account Value | $ 18,138.828096 | 18,138.828096 | $ 18,138.828096 | 18,138.828096 | $ 18,138.828096 | 15,869.10493 | 14,809.212688 | 16,752.593815 | 14,323.608711 | 12,988.431584 | 12,654.267803 | 11,661.215914 | 10,587.436515 | 9,827.4555 | 10,000 | ||
| Average Annual Return, Percent | 14.30% | 6.91% | 6.14% | ||||||||||||||
| John Hancock 2025 Lifetime Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | John Hancock 2025 Lifetime Index | ||||||||||||||||
| Account Value | $ 19,422.919578 | 19,422.919578 | $ 19,422.919578 | 19,422.919578 | $ 19,422.919578 | 16,908.465849 | 15,966.699912 | 18,301.587743 | 15,394.501994 | 13,721.805407 | 13,070.434799 | 11,943.006505 | 10,757.322674 | 9,678.1009 | 10,000 | ||
| Average Annual Return, Percent | 14.87% | 7.19% | 6.86% | ||||||||||||||
| S And P Target Date 2040 Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | S&P Target Date 2040 Index | ||||||||||||||||
| Account Value | $ 21,793.236848 | 21,793.236848 | $ 21,793.236848 | 21,793.236848 | $ 21,793.236848 | 18,246.676959 | 16,375.070582 | 18,961.17083 | 15,059.555618 | 13,429.82009 | 13,405.858726 | 11,971.422527 | 10,579.07708 | 9,756.891 | 10,000 | ||
| Average Annual Return, Percent | 19.44% | 10.17% | 8.10% | ||||||||||||||
| John Hancock 2040 Lifetime Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | John Hancock 2040 Lifetime Index | ||||||||||||||||
| Account Value | $ 23,419.741388 | 23,419.741388 | $ 23,419.741388 | 23,419.741388 | $ 23,419.741388 | 19,552.957343 | 17,834.417207 | 20,933.531263 | 16,383.156038 | 14,177.430298 | 14,003.678675 | 12,294.772004 | 10,619.050569 | 9,603.0176 | 10,000 | ||
| Average Annual Return, Percent | 19.78% | 10.55% | 8.88% | ||||||||||||||
| S And P Target Date 2055 Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | S&P Target Date 2055 Index | ||||||||||||||||
| Account Value | $ 23,051.132044 | 23,051.132044 | $ 23,051.132044 | 23,051.132044 | $ 23,051.132044 | 19,042.63917 | 16,873.575765 | 19,647.639321 | 15,295.633338 | 13,593.370608 | 13,662.497654 | 12,110.036937 | 10,552.350826 | 9,708.5924 | 10,000 | ||
| Average Annual Return, Percent | 21.05% | 11.14% | 8.71% | ||||||||||||||
| John Hancock 2055 Lifetime Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | John Hancock 2055 Lifetime Index | ||||||||||||||||
| Account Value | $ 24,371.318858 | 24,371.318858 | $ 24,371.318858 | 24,371.318858 | $ 24,371.318858 | 20,027.412204 | 18,010.855415 | 21,222.501819 | 16,383.628955 | 14,133.960156 | 14,017.923152 | 12,294.772004 | 10,619.050569 | 9,603.0176 | 10,000 | ||
| Average Annual Return, Percent | 21.69% | 11.51% | 9.32% | ||||||||||||||
| S And P Target Date 2020 Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | S&P Target Date 2020 Index | ||||||||||||||||
| Account Value | $ 17,142.948178 | 17,142.948178 | $ 17,142.948178 | 17,142.948178 | $ 17,142.948178 | 15,072.042725 | 14,177.613524 | 15,956.327411 | 14,022.439372 | 12,805.627633 | 12,376.210983 | 11,547.612617 | 10,604.654579 | 9,873.6684 | 10,000 | ||
| Average Annual Return, Percent | 13.74% | 6.01% | 5.54% | ||||||||||||||
| John Hancock 2020 Lifetime Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | John Hancock 2020 Lifetime Index | ||||||||||||||||
| Account Value | $ 17,998.423825 | 17,998.423825 | $ 17,998.423825 | 17,998.423825 | $ 17,998.423825 | 15,816.563664 | 15,034.051506 | 17,014.693526 | 14,725.868435 | 13,353.351904 | 12,629.60315 | 11,736.013789 | 10,737.498381 | 9,703.4054 | 10,000 | ||
| Average Annual Return, Percent | 13.79% | 6.15% | 6.05% | ||||||||||||||
| S And P Target Date 2035 Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | S&P Target Date 2035 Index | ||||||||||||||||
| Account Value | $ 20,700.978636 | 20,700.978636 | $ 20,700.978636 | 20,700.978636 | $ 20,700.978636 | 17,565.182827 | 15,955.063114 | 18,367.196124 | 14,877.716411 | 13,320.097509 | 13,220.391432 | 11,896.978128 | 10,585.587962 | 9,777.8793 | 10,000 | ||
| Average Annual Return, Percent | 17.85% | 9.22% | 7.55% | ||||||||||||||
| John Hancock 2035 Lifetime Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | John Hancock 2035 Lifetime Index | ||||||||||||||||
| Account Value | $ 22,120.208249 | 22,120.208249 | $ 22,120.208249 | 22,120.208249 | $ 22,120.208249 | 18,696.084184 | 17,262.006406 | 20,198.543117 | 16,152.862716 | 14,082.617653 | 13,732.001748 | 12,198.261618 | 10,654.367112 | 9,614.8317 | 10,000 | ||
| Average Annual Return, Percent | 18.31% | 9.44% | 8.26% | ||||||||||||||
| S And P Target Date 2015 Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | S&P Target Date 2015 Index | ||||||||||||||||
| Account Value | $ 16,531.875992 | 16,531.875992 | $ 16,531.875992 | 16,531.875992 | $ 16,531.875992 | 14,659.037897 | 13,893.3809 | 15,530.438697 | 13,780.501828 | 12,599.303055 | 12,127.524874 | 11,406.575358 | 10,595.973627 | 9,900.8611 | 10,000 | ||
| Average Annual Return, Percent | 12.78% | 5.58% | 5.16% | ||||||||||||||
| John Hancock 2015 Lifetime Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | John Hancock 2015 Lifetime Index | ||||||||||||||||
| Account Value | $ 16,941.832458 | 16,941.832458 | $ 16,941.832458 | 16,941.832458 | $ 16,941.832458 | 14,996.859726 | 14,302.169596 | 16,025.678965 | 14,084.845806 | 12,919.141702 | 12,170.589704 | 11,492.909166 | 10,678.162783 | 9,720.6199 | 10,000 | ||
| Average Annual Return, Percent | 12.97% | 5.57% | 5.41% | ||||||||||||||
| S And P Target Date 2030 Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | S&P Target Date 2030 Index | ||||||||||||||||
| Account Value | $ 19,366.123124 | 19,366.123124 | $ 19,366.123124 | 19,366.123124 | $ 19,366.123124 | 16,686.964551 | 15,364.17344 | 17,523.135536 | 14,605.624748 | 13,160.994025 | 12,943.267301 | 11,778.484275 | 10,586.506905 | 9,801.2624 | 10,000 | ||
| Average Annual Return, Percent | 16.06% | 8.03% | 6.83% | ||||||||||||||
| John Hancock 2030 Lifetime Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | John Hancock 2030 Lifetime Index | ||||||||||||||||
| Account Value | $ 20,825.759206 | 20,825.759206 | $ 20,825.759206 | 20,825.759206 | $ 20,825.759206 | 17,846.439447 | 16,665.427122 | 19,350.187008 | 15,865.987057 | 13,954.410831 | 13,423.110687 | 12,084.90885 | 10,705.510369 | 9,645.0092 | 10,000 | ||
| Average Annual Return, Percent | 16.69% | 8.33% | 7.61% | ||||||||||||||
| S And P Target Date 2050 Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | S&P Target Date 2050 Index | ||||||||||||||||
| Account Value | $ 22,909.976779 | 22,909.976779 | $ 22,909.976779 | 22,909.976779 | $ 22,909.976779 | 18,939.234145 | 16,794.66553 | 19,547.387244 | 15,256.225875 | 13,558.871315 | 13,620.74149 | 12,083.346824 | 10,564.485928 | 9,723.0055 | 10,000 | ||
| Average Annual Return, Percent | 20.97% | 11.06% | 8.64% | ||||||||||||||
| John Hancock 2050 Lifetime Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | John Hancock 2050 Lifetime Index | ||||||||||||||||
| Account Value | $ 24,371.318858 | 24,371.318858 | $ 24,371.318858 | 24,371.318858 | $ 24,371.318858 | 20,027.412204 | 18,010.855415 | 21,222.501819 | 16,383.628955 | 14,133.960156 | 14,017.923152 | 12,294.772004 | 10,619.050569 | 9,603.0176 | 10,000 | ||
| Average Annual Return, Percent | 21.69% | 11.51% | 9.32% | ||||||||||||||
| S And P Target Date 2045 Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | S&P Target Date 2045 Index | ||||||||||||||||
| Account Value | $ 22,481.890242 | 22,481.890242 | $ 22,481.890242 | 22,481.890242 | $ 22,481.890242 | 18,674.086103 | 16,619.287235 | 19,311.117603 | 15,165.243728 | 13,493.888055 | 13,517.346193 | 12,029.50844 | 10,570.971371 | 9,738.3809 | 10,000 | ||
| Average Annual Return, Percent | 20.39% | 10.75% | 8.44% | ||||||||||||||
| John Hancock 2045 Lifetime Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | John Hancock 2045 Lifetime Index | ||||||||||||||||
| Account Value | $ 24,174.67952 | 24,174.67952 | $ 24,174.67952 | 24,174.67952 | $ 24,174.67952 | 19,970.541281 | 18,025.167507 | 21,222.27851 | 16,383.628955 | 14,133.960156 | 14,017.923152 | 12,294.772004 | 10,619.050569 | $ 9,603.0176 | $ 10,000 | ||
| Average Annual Return, Percent | 21.05% | 11.32% | 9.22% | ||||||||||||||
| John Hancock 2060 Lifetime Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | John Hancock 2060 Lifetime Index | ||||||||||||||||
| Account Value | $ 24,788.605603 | $ 24,788.605603 | $ 24,788.605603 | $ 24,788.605603 | $ 24,788.605603 | $ 20,370.322397 | $ 18,319.238038 | $ 21,585.874387 | $ 16,664.150139 | $ 14,375.962416 | $ 14,257.938622 | $ 12,505.283608 | $ 10,800.8704 | $ 10,000 | |||
| Average Annual Return, Percent | 21.69% | 11.51% | 11.38% |
| Shareholder Report, Holdings (Details) | Aug. 31, 2024 |
| C000221529 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000221529 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000221529 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 57.40% |
| C000221529 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.10% |
| C000221529 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000221529 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000221529 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000221529 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000228345 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000228345 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000228345 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 57.40% |
| C000228345 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.10% |
| C000228345 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000228345 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000228345 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000228345 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000221527 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000221527 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000221527 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 57.40% |
| C000221527 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.10% |
| C000221527 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000221527 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000221527 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000221527 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000221528 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000221528 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000221528 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 57.40% |
| C000221528 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.10% |
| C000221528 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000221528 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000221528 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000221528 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000132735 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| C000132735 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| C000132735 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.80% |
| C000132735 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.40% |
| C000132735 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27.40% |
| C000132735 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 49.50% |
| C000132735 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.70% |
| C000132735 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.80% |
| C000228330 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| C000228330 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| C000228330 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.80% |
| C000228330 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.40% |
| C000228330 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27.40% |
| C000228330 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 49.50% |
| C000228330 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.70% |
| C000228330 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.80% |
| C000132740 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| C000132740 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| C000132740 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.80% |
| C000132740 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.40% |
| C000132740 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27.40% |
| C000132740 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 49.50% |
| C000132740 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.70% |
| C000132740 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.80% |
| C000132742 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| C000132742 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| C000132742 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.80% |
| C000132742 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.40% |
| C000132742 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27.40% |
| C000132742 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 49.50% |
| C000132742 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.70% |
| C000132742 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.80% |
| C000132759 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| C000132759 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| C000132759 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 50.50% |
| C000132759 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.80% |
| C000132759 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.70% |
| C000132759 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 43.30% |
| C000132759 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.80% |
| C000132759 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.50% |
| C000228333 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| C000228333 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| C000228333 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 50.50% |
| C000228333 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.80% |
| C000228333 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.70% |
| C000228333 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 43.30% |
| C000228333 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.80% |
| C000228333 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.50% |
| C000132764 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| C000132764 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| C000132764 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 50.50% |
| C000132764 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.80% |
| C000132764 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.70% |
| C000132764 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 43.30% |
| C000132764 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.80% |
| C000132764 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.50% |
| C000132766 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| C000132766 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| C000132766 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 50.50% |
| C000132766 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.80% |
| C000132766 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.70% |
| C000132766 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 43.30% |
| C000132766 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.80% |
| C000132766 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.50% |
| C000132783 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000132783 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000132783 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.80% |
| C000132783 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 46.70% |
| C000132783 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| C000132783 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 42.20% |
| C000132783 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 37.50% |
| C000132783 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| C000228336 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000228336 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000228336 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.80% |
| C000228336 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 46.70% |
| C000228336 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| C000228336 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 42.20% |
| C000228336 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 37.50% |
| C000228336 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| C000132788 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000132788 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000132788 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.80% |
| C000132788 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 46.70% |
| C000132788 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| C000132788 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 42.20% |
| C000132788 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 37.50% |
| C000132788 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| C000132790 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000132790 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000132790 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.80% |
| C000132790 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 46.70% |
| C000132790 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| C000132790 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 42.20% |
| C000132790 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 37.50% |
| C000132790 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| C000138480 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000138480 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000138480 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 57.40% |
| C000138480 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.10% |
| C000138480 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000138480 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000138480 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000138480 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000228341 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000228341 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000228341 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 57.40% |
| C000228341 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.10% |
| C000228341 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000228341 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000228341 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000228341 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000138485 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000138485 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000138485 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 57.40% |
| C000138485 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.10% |
| C000138485 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000138485 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000138485 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000138485 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000138487 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000138487 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000138487 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 57.40% |
| C000138487 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.10% |
| C000138487 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000138487 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000138487 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000138487 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000132751 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| C000132751 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| C000132751 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 45.70% |
| C000132751 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.90% |
| C000132751 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.80% |
| C000132751 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 47.20% |
| C000132751 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.50% |
| C000132751 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000132751 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.70% |
| C000228332 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| C000228332 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| C000228332 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 45.70% |
| C000228332 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.90% |
| C000228332 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.80% |
| C000228332 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 47.20% |
| C000228332 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.50% |
| C000228332 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000228332 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.70% |
| C000132756 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| C000132756 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| C000132756 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 45.70% |
| C000132756 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.90% |
| C000132756 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.80% |
| C000132756 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 47.20% |
| C000132756 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.50% |
| C000132756 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000132756 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.70% |
| C000132758 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| C000132758 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| C000132758 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 45.70% |
| C000132758 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.90% |
| C000132758 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.80% |
| C000132758 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 47.20% |
| C000132758 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.50% |
| C000132758 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000132758 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.70% |
| C000132775 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000132775 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000132775 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.20% |
| C000132775 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 42.10% |
| C000132775 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.10% |
| C000132775 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.10% |
| C000132775 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.20% |
| C000132775 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000132775 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| C000228335 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000228335 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000228335 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.20% |
| C000228335 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 42.10% |
| C000228335 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.10% |
| C000228335 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.10% |
| C000228335 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.20% |
| C000228335 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000228335 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| C000132780 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000132780 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000132780 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.20% |
| C000132780 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 42.10% |
| C000132780 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.10% |
| C000132780 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.10% |
| C000132780 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.20% |
| C000132780 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000132780 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| C000132782 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000132782 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000132782 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.20% |
| C000132782 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 42.10% |
| C000132782 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.10% |
| C000132782 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.10% |
| C000132782 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.20% |
| C000132782 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000132782 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| C000132799 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000132799 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000132799 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 57.40% |
| C000132799 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.10% |
| C000132799 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000132799 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.30% |
| C000132799 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.30% |
| C000228338 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000228338 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000228338 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 57.40% |
| C000228338 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.10% |
| C000228338 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000228338 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.30% |
| C000228338 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.30% |
| C000132804 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000132804 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000132804 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 57.40% |
| C000132804 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.10% |
| C000132804 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000132804 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.30% |
| C000132804 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.30% |
| C000132806 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000132806 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000132806 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 57.40% |
| C000132806 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.10% |
| C000132806 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000132806 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.30% |
| C000132806 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.30% |
| C000132750 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| C000132750 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| C000132750 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 44.30% |
| C000132750 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.70% |
| C000132750 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.60% |
| C000132750 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 47.80% |
| C000132750 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20% |
| C000132750 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27.80% |
| C000228331 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| C000228331 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| C000228331 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 44.30% |
| C000228331 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.70% |
| C000228331 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.60% |
| C000228331 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 47.80% |
| C000228331 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20% |
| C000228331 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27.80% |
| C000132747 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| C000132747 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| C000132747 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 44.30% |
| C000132747 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.70% |
| C000132747 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.60% |
| C000132747 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 47.80% |
| C000132747 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20% |
| C000132747 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27.80% |
| C000132749 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| C000132749 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| C000132749 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 44.30% |
| C000132749 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.70% |
| C000132749 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.60% |
| C000132749 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 47.80% |
| C000132749 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20% |
| C000132749 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27.80% |
| C000132767 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| C000132767 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| C000132767 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 53.50% |
| C000132767 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 37.10% |
| C000132767 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.40% |
| C000132767 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000132767 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28% |
| C000132767 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000132767 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.20% |
| C000228334 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| C000228334 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| C000228334 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 53.50% |
| C000228334 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 37.10% |
| C000228334 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.40% |
| C000228334 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000228334 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28% |
| C000228334 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000228334 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.20% |
| C000132772 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| C000132772 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| C000132772 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 53.50% |
| C000132772 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 37.10% |
| C000132772 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.40% |
| C000132772 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000132772 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28% |
| C000132772 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000132772 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.20% |
| C000132774 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| C000132774 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| C000132774 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 53.50% |
| C000132774 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 37.10% |
| C000132774 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.40% |
| C000132774 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000132774 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28% |
| C000132774 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000132774 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.20% |
| C000132791 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000132791 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000132791 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 56.70% |
| C000132791 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.90% |
| C000132791 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000132791 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41% |
| C000132791 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 39% |
| C000132791 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000132791 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000228337 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000228337 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000228337 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 56.70% |
| C000228337 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.90% |
| C000228337 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000228337 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41% |
| C000228337 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 39% |
| C000228337 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000228337 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000132796 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000132796 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000132796 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 56.70% |
| C000132796 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.90% |
| C000132796 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000132796 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41% |
| C000132796 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 39% |
| C000132796 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000132796 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000132798 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000132798 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000132798 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 56.70% |
| C000132798 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.90% |
| C000132798 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000132798 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41% |
| C000132798 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 39% |
| C000132798 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000132798 [Member] | Fixed income Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000167628 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000167628 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000167628 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 57.40% |
| C000167628 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.10% |
| C000167628 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000167628 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000167628 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000167628 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000228344 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000228344 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000228344 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 57.40% |
| C000228344 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.10% |
| C000228344 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000228344 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000228344 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000228344 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000167633 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000167633 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000167633 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 57.40% |
| C000167633 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.10% |
| C000167633 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000167633 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000167633 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000167633 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000167635 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000167635 [Member] | US Government Debt Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000167635 [Member] | Affiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 57.40% |
| C000167635 [Member] | Equity Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.10% |
| C000167635 [Member] | Fixed income Affiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000167635 [Member] | Unaffiliated investment companies [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000167635 [Member] | Equity Unaffiliated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.20% |
| C000167635 [Member] | Short term investments and other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
