| Form N-CSR Cover | 6 Months Ended |
| Sep. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Nicholas Equity Income Fund, Inc. |
| Entity Central Index Key | 0000913131 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Sep. 30, 2024 |
| Shareholder Report | 6 Months Ended |
| Sep. 30, 2024 USD ($) shares | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Nicholas Equity Income Fund, Inc. |
| Entity Central Index Key | 0000913131 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Sep. 30, 2024 |
| CLASS I | |
| Shareholder Report [Line Items] | |
| Fund Name | Nicholas Equity Income Fund, Inc. |
| Class Name | Nicholas Equity Income Fund, Inc. |
| Trading Symbol | NSEIX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.nicholasfunds.com 1-800-544-6547 |
| Additional Information Phone Number | 1-800-544-6547 |
| Additional Information Website | www.nicholasfunds.com |
| Expenses [Text Block] | What Were the Portfolio Costs for the Last Six Months? (based on a hypothetical $10,000 investment) Portfolio Name Costs of a $10,000 investment Annualized costs paid as a percentage of a $10,000 investment Nicholas Equity Income Fund $36 0.70% |
| Expenses Paid, Amount | $ 36 |
| Expense Ratio, Percent | 0.70% |
| Net Assets | $ 487,519,819 |
| Holdings Count | shares | 61 |
| Investment Company, Portfolio Turnover | 23.60% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics As of September 30, 2024 Net Assets $487,519,819 Number of Portfolio Holdings 61 Portfolio Turnover Rate 23.60% |
| Holdings [Text Block] | Top Ten Equity Holdings As of September 30, 2024 Name Percentage of Net Assets Microsoft Corporation 3.51% Astrazeneca PLC Sponsored ADR 2.45% CMS Energy Corporation 2.42% JPMorgan Chase & Co. 2.37% Abbott Laboratories 2.35% Chevron Corporation 2.31% Oracle Corporation 2.30% Broadcom Inc. 2.15% TJX Companies Inc 2.14% International Business Machines Corporation 2.09% Total of top ten 24.09% Sector Diversification (As a Percentage of Total Investments) As of September 30, 2024 Sector % of Net Assets Health Care 18.30% Financials 15.13% Information Technology 14.76% Consumer Staples 10.53% Industrials 8.68% Materials 6.36% Consumer Discretionary 5.13% Utilities 5.00% Real Estate 4.76% Energy 4.10% Communication Services 1.11% Short-Term Investments 6.14% |
| Largest Holdings [Text Block] | Top Ten Equity Holdings As of September 30, 2024 Name Percentage of Net Assets Microsoft Corporation 3.51% Astrazeneca PLC Sponsored ADR 2.45% CMS Energy Corporation 2.42% JPMorgan Chase & Co. 2.37% Abbott Laboratories 2.35% Chevron Corporation 2.31% Oracle Corporation 2.30% Broadcom Inc. 2.15% TJX Companies Inc 2.14% International Business Machines Corporation 2.09% Total of top ten 24.09% |
| Shareholder Report, Holdings (Details) - CLASS I | Sep. 30, 2024 |
| Health Care [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.30% |
| Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.13% |
| Information Technology [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.76% |
| Consumer Staples [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.53% |
| Industrials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.68% |
| Materials [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.36% |
| Consumer Discretionary [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.13% |
| Utilities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Real Estate [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.76% |
| Energy [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Communication Services [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.11% |
| Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.14% |
| Microsoft Corporation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.51% |
| Astrazeneca P L C Sponsored A D R [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.45% |
| C M S Energy Corporation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.42% |
| J P Morgan Chaseamp Co [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.37% |
| Abbott Laboratories [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.35% |
| Chevron Corporation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.31% |
| Oracle Corporation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Broadcom Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.15% |
| T J X Companies Inc [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.14% |
| International Business Machines Corporation [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.09% |
| Totaloftopten [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.09% |
