Columbia Emerging Markets Fund (EEMAX) N-CSR5 Nov 24Certified annual shareholder report (management investment company)Financial data

Company Profile

Form N-CSR Cover

Form N-CSR Cover	12 Months Ended
Form N-CSR Cover	Aug. 31, 2024
Shareholder Report [Line Items]
Document Type	N-CSR
Amendment Flag	false
Registrant Name	Columbia Funds Series Trust I
Entity Central Index Key	0000773757
Entity Investment Company Type	N-1A
Document Period End Date	Aug. 31, 2024

Shareholder Report

Shareholder Report	12 Months Ended
Shareholder Report	Aug. 31, 2024 USD ($) Holding
Shareholder Report [Line Items]
Document Type	N-CSR
Amendment Flag	false
Registrant Name	Columbia Funds Series Trust I
Entity Central Index Key	0000773757
Entity Investment Company Type	N-1A
Document Period End Date	Aug. 31, 2024
Columbia Small Cap Growth Fund - Class A
Shareholder Report [Line Items]
Fund Name	Columbia Small Cap Growth Fund
Class Name	Class A
Trading Symbol	CGOAX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Columbia Small Cap Growth Fund (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 columbiathreadneedleus.com/resources/literature 1-800-345-6611.
Additional Information Phone Number	1-800-345-6611
Additional Information Website	columbiathreadneedleus.com/resources/literature
Expenses [Text Block]	What were the Fund costs for the reporting period? (Based on a hypothetical $10,000 investment) Class Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Class A $ 1.25 %
Expenses Paid, Amount	$ 136
Expense Ratio, Percent	1.25%
Factors Affecting Performance [Text Block]	Management's Discussion of Fund Performance The performance of Class A shares for the period presented is shown in the Average Annual Total Returns table. Top Performance Contributors Stock selection Allocations Individual holdings Top Performance Detractors Stock selection Allocations Individual holdings
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future performance.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	Average Annual Total Returns (%) 1 year 5 years 10 years Class A (excluding sales charges) (a) 18.31 10.01 12.57 Class A (including sales charges) (a) 11.52 8.72 11.91 Russell ® 17.67 8.35 8.21 Russell ® 26.14 15.19 12.36 (a) Effective August 1, 2024, the Fund compares its performance to the Russell ®
No Deduction of Taxes [Text Block]	Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares.
Updated Performance Information Location [Text Block]	Visit columbiathreadneedleus.com/investment-products/mutual-funds
Net Assets	$ 2,096,141,883
Holdings Count \| Holding	101
Advisory Fees Paid, Amount	$ 14,710,617
Investment Company, Portfolio Turnover	146%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Tot al number of 101 Management services fees $ Portfolio turnover for the reporting period 146%
Holdings [Text Block]	Graphical Representation of Fund The tables below show the investment makeup of the Fund repr esen Top Holdi ngs FTAI Aviation Ltd. 3.1 % Carpenter Technology Corp. 2.9 % Onto Innovation, Inc. 2.8 % AAON, Inc. 2.7 % XPO, Inc. 2.7 % SiteOne Landscape Supply, Inc. 2.5 % Chemed Corp. 2.5 % ICU Medical, Inc. 2.5 % RBC Bearings, Inc. 2.3 % Bio-Techne Corp. 2.3 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdi ngs FTAI Aviation Ltd. 3.1 % Carpenter Technology Corp. 2.9 % Onto Innovation, Inc. 2.8 % AAON, Inc. 2.7 % XPO, Inc. 2.7 % SiteOne Landscape Supply, Inc. 2.5 % Chemed Corp. 2.5 % ICU Medical, Inc. 2.5 % RBC Bearings, Inc. 2.3 % Bio-Techne Corp. 2.3 %
Updated Prospectus Web Address	columbiathreadneedleus.com/investment-products/mutual-funds
Columbia Small Cap Growth Fund - Advisor Class
Shareholder Report [Line Items]
Fund Name	Columbia Small Cap Growth Fund
Class Name	Advisor Class
Trading Symbol	CHHRX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Columbia Small Cap Growth Fund (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 columbiathreadneedleus.com/resources/literature 1-800-345-6611.
Additional Information Phone Number	1-800-345-6611
Additional Information Website	columbiathreadneedleus.com/resources/literature
Expenses [Text Block]	What were the Fund costs for the reporting period? (Based on a hypothetical $10,000 investment) Class Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Advisor Class $ 0.99 %
Expenses Paid, Amount	$ 108
Expense Ratio, Percent	0.99%
Factors Affecting Performance [Text Block]	Management's Discussion of Fund Performance The performance of Advisor Class shares for the period presented is shown in the Average Annual Total Returns table. Top Performance Contributors Stock selection Allocations Individual holdings Top Performance Detractors Stock selection Allocations Individual holdings
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future performance.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	Average Annual Total Returns (%) 1 year 5 years 10 years Advisor Class (a) 18.66 10.29 12.86 Russell ® 17.67 8.35 8.21 Russell ® 26.14 15.19 12.36 (a) Effective August 1, 2024, the Fund compares its performance to the Russell ®
No Deduction of Taxes [Text Block]	Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares.
Updated Performance Information Location [Text Block]	Visit columbiathreadneedleus.com/investment-products/mutual-funds
Net Assets	$ 2,096,141,883
Holdings Count \| Holding	101
Advisory Fees Paid, Amount	$ 14,710,617
Investment Company, Portfolio Turnover	146%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfo lio holdin 101 Management services fees $ Portfolio turnover for the reporting period 146%
Holdings [Text Block]	Graphical Representation of Fund The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfo lio Top Holdings FTAI Aviation Ltd. 3.1 % Carpenter Technology Corp. 2.9 % Onto Innovation, Inc. 2.8 % AAON, Inc. 2.7 % XPO, Inc. 2.7 % SiteOne Landscape Supply, Inc. 2.5 % Chemed Corp. 2.5 % ICU Medical, Inc. 2.5 % RBC Bearings, Inc. 2.3 % Bio-Techne Corp. 2.3 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings FTAI Aviation Ltd. 3.1 % Carpenter Technology Corp. 2.9 % Onto Innovation, Inc. 2.8 % AAON, Inc. 2.7 % XPO, Inc. 2.7 % SiteOne Landscape Supply, Inc. 2.5 % Chemed Corp. 2.5 % ICU Medical, Inc. 2.5 % RBC Bearings, Inc. 2.3 % Bio-Techne Corp. 2.3 %
Updated Prospectus Web Address	columbiathreadneedleus.com/investment-products/mutual-funds
Columbia Small Cap Growth Fund - Class C
Shareholder Report [Line Items]
Fund Name	Columbia Small Cap Growth Fund
Class Name	Class C
Trading Symbol	CGOCX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Columbia Small Cap Growth Fund (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 columbiathreadneedleus.com/resources/literature 1-800-345-6611.
Additional Information Phone Number	1-800-345-6611
Additional Information Website	columbiathreadneedleus.com/resources/literature
Expenses [Text Block]	What were the Fund costs for the reporting period? (Based on a hypothetical $10,000 investment) Class Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Class C $ 2.00 %
Expenses Paid, Amount	$ 217
Expense Ratio, Percent	2%
Factors Affecting Performance [Text Block]	Management's Discussion of Fund Performance The performance of Class C shares for the period presented is shown in the Average Annual Total Returns table. Top Performance Contributors Stock selection Allocations Individual holdings Top Performance Detractors Stock selection Allocations Individual holdings
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future performance.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	Average Annual Total Returns (%) 1 year 5 years 10 years Class C (excluding sales charges) (a) 17.48 9.20 11.73 Class C (including sales charges) (a) 16.48 9.20 11.73 Russell ® 17.67 8.35 8.21 Russell ® 26.14 15.19 12.36 (a) Effective August 1, 2024, the Fund compares its performance to the Russell ®
No Deduction of Taxes [Text Block]	Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares.
Updated Performance Information Location [Text Block]	Visit columbiathreadneedleus.com/investment-products/mutual-funds
Net Assets	$ 2,096,141,883
Holdings Count \| Holding	101
Advisory Fees Paid, Amount	$ 14,710,617
Investment Company, Portfolio Turnover	146%
Additional Fund Statistics [Text Block]	Key Fund Sta tist Fund net assets $ Total number of portfolio holdings 101 Management services fees $ Portfolio turnover for the reporting period 146%
Holdings [Text Block]	Graphical Representation of Fund The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change. Top H FTAI Aviation Ltd. 3.1 % Carpenter Technology Corp. 2.9 % Onto Innovation, Inc. 2.8 % AAON, Inc. 2.7 % XPO, Inc. 2.7 % SiteOne Landscape Supply, Inc. 2.5 % Chemed Corp. 2.5 % ICU Medical, Inc. 2.5 % RBC Bearings, Inc. 2.3 % Bio-Techne Corp. 2.3 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top H FTAI Aviation Ltd. 3.1 % Carpenter Technology Corp. 2.9 % Onto Innovation, Inc. 2.8 % AAON, Inc. 2.7 % XPO, Inc. 2.7 % SiteOne Landscape Supply, Inc. 2.5 % Chemed Corp. 2.5 % ICU Medical, Inc. 2.5 % RBC Bearings, Inc. 2.3 % Bio-Techne Corp. 2.3 %
Updated Prospectus Web Address	columbiathreadneedleus.com/investment-products/mutual-funds
Columbia Small Cap Growth Fund - Institutional Class
Shareholder Report [Line Items]
Fund Name	Columbia Small Cap Growth Fund
Class Name	Institutional Class
Trading Symbol	CMSCX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Columbia Small Cap Growth Fund (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 columbiathreadneedleus.com/resources/literature 1-800-345-6611.
Additional Information Phone Number	1-800-345-6611
Additional Information Website	columbiathreadneedleus.com/resources/literature
Expenses [Text Block]	What were the Fund costs for the reporting period? (Based on a hypothetical $10,000 investment) Class Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Institutional Class $ 0.99 %
Expenses Paid, Amount	$ 108
Expense Ratio, Percent	0.99%
Factors Affecting Performance [Text Block]	Management's Discussion of Fund Performance The performance of Institutional Class shares for the period presented is shown in the Average Annual Total Returns table. Top Performance Contributors Stock selection Allocations Individual holdings Top Performance Detractors Stock selection Allocations Individual holdings
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future performance.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	Average Annual Total Returns (%) 1 year 5 years 10 years Institutional Class (a) 18.66 10.28 12.86 Russell ® 17.67 8.35 8.21 Russell ® 26.14 15.19 12.36 (a) Effective August 1, 2024, the Fund compares its performance to the Russell ®
No Deduction of Taxes [Text Block]	Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares.
Updated Performance Information Location [Text Block]	Visit columbiathreadneedleus.com/investment-products/mutual-funds
Net Assets	$ 2,096,141,883
Holdings Count \| Holding	101
Advisory Fees Paid, Amount	$ 14,710,617
Investment Company, Portfolio Turnover	146%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 101 Managemen t serv $ Portfolio turnover for the reporting period 146%
Holdings [Text Block]	Graphical Repr esenta The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change. Top Holdings FTAI Aviation Ltd. 3.1 % Carpenter Technology Corp. 2.9 % Onto Innovation, Inc 2.8 % AAON, Inc. 2.7 % XPO, Inc. 2.7 % SiteOne Landscape Supply, Inc. 2.5 % Chemed Corp. 2.5 % ICU Medical, Inc. 2.5 % RBC Bearings, Inc. 2.3 % Bio-Techne Corp. 2.3 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings FTAI Aviation Ltd. 3.1 % Carpenter Technology Corp. 2.9 % Onto Innovation, Inc 2.8 % AAON, Inc. 2.7 % XPO, Inc. 2.7 % SiteOne Landscape Supply, Inc. 2.5 % Chemed Corp. 2.5 % ICU Medical, Inc. 2.5 % RBC Bearings, Inc. 2.3 % Bio-Techne Corp. 2.3 %
Updated Prospectus Web Address	columbiathreadneedleus.com/investment-products/mutual-funds
Columbia Small Cap Growth Fund - Institutional 2 Class
Shareholder Report [Line Items]
Fund Name	Columbia Small Cap Growth Fund
Class Name	Institutional 2 Class
Trading Symbol	CSCRX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Columbia Small Cap Growth Fund (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 columbiathreadneedleus.com/resources/literature 1-800-345-6611.
Additional Information Phone Number	1-800-345-6611
Additional Information Website	columbiathreadneedleus.com/resources/literature
Expenses [Text Block]	What were the Fund costs for the reporting period? (Based on a hypothetical $10,000 investment) Class Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Institutional 2 Class $ 0.89 %
Expenses Paid, Amount	$ 97
Expense Ratio, Percent	0.89%
Factors Affecting Performance [Text Block]	Management's Discussion of Fund Performance The performance of Institutional 2 Class shares for the period presented is shown in the Average Annual Total Returns table. Top Performance Contributors Stock selection Allocations Individual holdings Top Performance Detractors Stock selection Allocations Individual holdings
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future performance.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	Average Annual Total Returns (%) 1 year 5 years 10 years Institutional 2 Class (a) 18.79 10.40 12.98 Russell ® 17.67 8.35 8.21 Russell ® 26.14 15.19 12.36 (a) Effective August 1, 2024, the Fund compares its performance to the Russell ®
No Deduction of Taxes [Text Block]	Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares.
Updated Performance Information Location [Text Block]	Visit columbiathreadneedleus.com/investment-products/mutual-funds
Net Assets	$ 2,096,141,883
Holdings Count \| Holding	101
Advisory Fees Paid, Amount	$ 14,710,617
Investment Company, Portfolio Turnover	146%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 101 Management services fees $ Portfolio turnover for th e rep 146%
Holdings [Text Block]	Graphical Representation of Fund The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change. Top Holdings FTAI Aviation Ltd 3.1 % Carpenter Technology Corp. 2.9 % Onto Innovation, Inc. 2.8 % AAON, Inc. 2.7 % XPO, Inc. 2.7 % SiteOne Landscape Supply, Inc. 2.5 % Chemed Corp. 2.5 % ICU Medical, Inc. 2.5 % RBC Bearings, Inc. 2.3 % Bio-Techne Corp. 2.3 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings FTAI Aviation Ltd 3.1 % Carpenter Technology Corp. 2.9 % Onto Innovation, Inc. 2.8 % AAON, Inc. 2.7 % XPO, Inc. 2.7 % SiteOne Landscape Supply, Inc. 2.5 % Chemed Corp. 2.5 % ICU Medical, Inc. 2.5 % RBC Bearings, Inc. 2.3 % Bio-Techne Corp. 2.3 %
Updated Prospectus Web Address	columbiathreadneedleus.com/investment-products/mutual-funds
Columbia Small Cap Growth Fund - Institutional 3 Class
Shareholder Report [Line Items]
Fund Name	Columbia Small Cap Growth Fund
Class Name	Institutional 3 Class
Trading Symbol	CSGYX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Columbia Small Cap Growth Fund (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 columbiathreadneedleus.com/resources/literature 1-800-345-6611.
Additional Information Phone Number	1-800-345-6611
Additional Information Website	columbiathreadneedleus.com/resources/literature
Expenses [Text Block]	What were the Fund costs for the reporting period? (Based on a hypothetical $ 10,000 Class Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Institutional 3 Class $ 0.84 %
Expenses Paid, Amount	$ 92
Expense Ratio, Percent	0.84%
Factors Affecting Performance [Text Block]	Management's Discussion of Fund Performance The performance of Institutional 3 Class shares for the period presented is shown in the Average Annual Total Returns table. Top Performance Contributors Stock selection Allocations Individual holdings Top Performance Detractors Stock selection Allocations Individual holdings
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future performance.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	Average Annual Total Returns (%) 1 year 5 years 10 years Institutional 3 Class (a) 18.76 10.44 13.03 Russell ® 17.67 8.35 8.21 Russell ® 26.14 15.19 12.36 (a) Effective August 1, 2024, the Fund compares its performance to the Russell ®
No Deduction of Taxes [Text Block]	Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares.
Updated Performance Information Location [Text Block]	Visit columbiathreadneedleus.com/investment-products/mutual-funds
Net Assets	$ 2,096,141,883
Holdings Count \| Holding	101
Advisory Fees Paid, Amount	$ 14,710,617
Investment Company, Portfolio Turnover	146%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 101 Managem ent ser $ Portfolio turnover for the reporting period 146%
Holdings [Text Block]	Graphical Representation of Fund The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change. Top Holdings FTAI Aviation Ltd. 3.1 % Carpenter Technology Corp. 2.9 % Onto Innovation, Inc. 2.8 % AAON, Inc. 2.7 % XPO, Inc. 2.7 % SiteOne Landscape Supply, Inc. 2.5 % Chemed Corp. 2.5 % ICU M edica 2.5 % RBC Bearings, Inc. 2.3 % Bio-Techne Corp. 2.3 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings FTAI Aviation Ltd. 3.1 % Carpenter Technology Corp. 2.9 % Onto Innovation, Inc. 2.8 % AAON, Inc. 2.7 % XPO, Inc. 2.7 % SiteOne Landscape Supply, Inc. 2.5 % Chemed Corp. 2.5 % ICU M edica 2.5 % RBC Bearings, Inc. 2.3 % Bio-Techne Corp. 2.3 %
Updated Prospectus Web Address	columbiathreadneedleus.com/investment-products/mutual-funds
Columbia Small Cap Growth Fund - Class R
Shareholder Report [Line Items]
Fund Name	Columbia Small Cap Growth Fund
Class Name	Class R
Trading Symbol	CCRIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Columbia Small Cap Growth Fund (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 columbiathreadneedleus.com/resources/literature 1-800-345-6611.
Additional Information Phone Number	1-800-345-6611
Additional Information Website	columbiathreadneedleus.com/resources/literature
Expenses [Text Block]	What were the Fund costs for the reporting period? (Based on a hypothetical $10,000 investment) Class Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Class R $ 1.50 %
Expenses Paid, Amount	$ 163
Expense Ratio, Percent	1.50%
Factors Affecting Performance [Text Block]	Management's Discussion of Fund Performance The performance of Class R shares for the period presented is shown in the Average Annual Total Returns table. Top Performance Contributors Stock selection Allocations Individual holdings Top Performance Detractors Stock selection Allocations Individual holdings
Performance Past Does Not Indicate Future [Text]	Past performance does not guarantee future performance.
Line Graph [Table Text Block]
Average Annual Return [Table Text Block]	Average Annual Total Returns (%) 1 year 5 years 10 years Class R (a) 18.00 9.73 12.29 Russell ® 17.67 8.35 8.21 Russell ® 26.14 15.19 12.36 (a) Effective August 1, 2024, the Fund compares its performance to the Russell ®
No Deduction of Taxes [Text Block]	Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares.
Updated Performance Information Location [Text Block]	Visit columbiathreadneedleus.com/investment-products/mutual-funds
Net Assets	$ 2,096,141,883
Holdings Count \| Holding	101
Advisory Fees Paid, Amount	$ 14,710,617
Investment Company, Portfolio Turnover	146%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fun d net asset $ Total number of portfolio holdings 101 Management services fees $ Portfolio turnover for the reporting period 146%
Holdings [Text Block]	Graphical Representation of Fund The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change. Top Holdings FTAI Aviation Ltd. 3.1 % Carpenter Technology Corp. 2.9 % Onto Innovation, Inc. 2.8 % AAON, Inc. 2.7 % XPO, Inc. 2.7 % SiteOne Landscape Supply, Inc. 2.5 % Chemed Corp. 2.5 % ICU Medical, Inc. 2.5 % RBC Bearings, Inc. 2.3 % Bio-Techne Corp. 2.3 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings FTAI Aviation Ltd. 3.1 % Carpenter Technology Corp. 2.9 % Onto Innovation, Inc. 2.8 % AAON, Inc. 2.7 % XPO, Inc. 2.7 % SiteOne Landscape Supply, Inc. 2.5 % Chemed Corp. 2.5 % ICU Medical, Inc. 2.5 % RBC Bearings, Inc. 2.3 % Bio-Techne Corp. 2.3 %
Updated Prospectus Web Address	columbiathreadneedleus.com/investment-products/mutual-funds

Shareholder Report, Line Graph

Shareholder Report, Line Graph (Details) - USD ($)	12 Months Ended
Shareholder Report, Line Graph (Details) - USD ($)	Aug. 31, 2024	Aug. 31, 2023	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014
Columbia Small Cap Growth Fund - Class R
Account Value [Line Items]
Line Graph and Table Measure Name	Class R
Account Value	$ 31,876	$ 27,014	$ 23,286	$ 38,981	$ 27,790	$ 20,040	$ 18,637	$ 13,986	$ 11,455	$ 11,163	$ 10,000
Columbia Small Cap Growth Fund - Institutional 3 Class
Account Value [Line Items]
Line Graph and Table Measure Name	Institutional 3 Class
Account Value	$ 34,050	28,671	24,550	40,833	28,922	20,726	19,144	14,274	11,609	11,238	10,000
Columbia Small Cap Growth Fund - Institutional 2 Class
Account Value [Line Items]
Line Graph and Table Measure Name	Institutional 2 Class
Account Value	$ 33,880	28,522	24,451	40,675	28,825	20,663	19,103	14,248	11,596	11,233	10,000
Columbia Small Cap Growth Fund - Institutional Class
Account Value [Line Items]
Line Graph and Table Measure Name	Institutional Class
Account Value	$ 33,521	28,251	24,242	40,377	28,636	20,550	19,013	14,198	11,570	11,216	10,000
Columbia Small Cap Growth Fund - Class C
Account Value [Line Items]
Line Graph and Table Measure Name	Class C (including sales charges)
Account Value	$ 30,330	25,817	22,370	37,638	26,964	19,535	18,268	13,779	11,343	11,107	10,000
Columbia Small Cap Growth Fund - Advisor Class
Account Value [Line Items]
Line Graph and Table Measure Name	Advisor Class
Account Value	$ 33,516	28,247	24,240	40,373	28,639	20,542	19,011	14,197	11,572	11,218	10,000
Columbia Small Cap Growth Fund - Class A
Account Value [Line Items]
Line Graph and Table Measure Name	Class A (including sales charges)
Account Value	$ 30,813	26,044	22,403	37,398	26,592	19,123	17,746	13,281	10,848	10,545	9,426
Russell 2000 Growth Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name	Russell® 2000 Growth Index
Account Value	$ 22,006	18,701	17,514	23,433	17,280	14,734	16,559	12,668	10,884	10,511	10,000
Russell 3000 Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name	Russell® 3000 Index
Account Value	$ 32,071	$ 25,424	$ 22,155	$ 25,548	$ 19,203	$ 15,813	$ 15,608	$ 12,980	$ 11,184	$ 10,036	$ 10,000

Shareholder Report, Average Ann

Shareholder Report, Average Annual Return (Details)		12 Months Ended	60 Months Ended	120 Months Ended
Shareholder Report, Average Annual Return (Details)		Aug. 31, 2024	Aug. 31, 2024	Aug. 31, 2024
Columbia Small Cap Growth Fund - Class R
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Class R
Average Annual Return, Percent	[1]	18%	9.73%	12.29%
Columbia Small Cap Growth Fund - Institutional 3 Class
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Institutional 3 Class
Average Annual Return, Percent	[1]	18.76%	10.44%	13.03%
Columbia Small Cap Growth Fund - Institutional 2 Class
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Institutional 2 Class
Average Annual Return, Percent	[1]	18.79%	10.40%	12.98%
Columbia Small Cap Growth Fund - Institutional Class
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Institutional Class
Average Annual Return, Percent	[1]	18.66%	10.28%	12.86%
Columbia Small Cap Growth Fund - Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Class C (including sales charges)
Average Annual Return, Percent	[1]	16.48%	9.20%	11.73%
Columbia Small Cap Growth Fund - Advisor Class
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Advisor Class
Average Annual Return, Percent	[1]	18.66%	10.29%	12.86%
Columbia Small Cap Growth Fund - Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Class A (including sales charges)
Average Annual Return, Percent	[1]	11.52%	8.72%	11.91%
Without Sales Load [Member] \| Columbia Small Cap Growth Fund - Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Class C (excluding sales charges)
Average Annual Return, Percent	[1]	17.48%	9.20%	11.73%
Without Sales Load [Member] \| Columbia Small Cap Growth Fund - Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Class A (excluding sales charges)
Average Annual Return, Percent	[1]	18.31%	10.01%	12.57%
Russell 2000 Growth Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Russell® 2000 Growth Index
Average Annual Return, Percent		17.67%	8.35%	8.21%
Russell 3000 Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Russell® 3000 Index
Average Annual Return, Percent		26.14%	15.19%	12.36%

[1]Effective August 1, 2024, the Fund compares its performance to the Russell® 3000 Index, a broad-based performance index that meets new regulatory requirements. The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests.

Shareholder Report, Holdings (D

Shareholder Report, Holdings (Details)	Aug. 31, 2024
Columbia Small Cap Growth Fund - Class A \| FTAI Aviation Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.10%
Columbia Small Cap Growth Fund - Class A \| Carpenter Technology Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Columbia Small Cap Growth Fund - Class A \| Onto Innovation, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Small Cap Growth Fund - Class A \| AAON, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Small Cap Growth Fund - Class A \| XPO, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Small Cap Growth Fund - Class A \| SiteOne Landscape Supply, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Small Cap Growth Fund - Class A \| Chemed Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Small Cap Growth Fund - Class A \| ICU Medical, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Small Cap Growth Fund - Class A \| RBC Bearings, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Small Cap Growth Fund - Class A \| Bio-Techne Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Small Cap Growth Fund - Class A \| Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	26.50%
Columbia Small Cap Growth Fund - Class A \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.40%
Columbia Small Cap Growth Fund - Class A \| Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.50%
Columbia Small Cap Growth Fund - Class A \| Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.20%
Columbia Small Cap Growth Fund - Class A \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.60%
Columbia Small Cap Growth Fund - Class A \| Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%
Columbia Small Cap Growth Fund - Class A \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%
Columbia Small Cap Growth Fund - Class A \| Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Small Cap Growth Fund - Class A \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Small Cap Growth Fund - Class A \| Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Columbia Small Cap Growth Fund - Class A \| Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.50%
Columbia Small Cap Growth Fund - Class A \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Columbia Small Cap Growth Fund - Advisor Class \| FTAI Aviation Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.10%
Columbia Small Cap Growth Fund - Advisor Class \| Carpenter Technology Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Columbia Small Cap Growth Fund - Advisor Class \| Onto Innovation, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Small Cap Growth Fund - Advisor Class \| AAON, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Small Cap Growth Fund - Advisor Class \| XPO, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Small Cap Growth Fund - Advisor Class \| SiteOne Landscape Supply, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Small Cap Growth Fund - Advisor Class \| Chemed Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Small Cap Growth Fund - Advisor Class \| ICU Medical, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Small Cap Growth Fund - Advisor Class \| RBC Bearings, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Small Cap Growth Fund - Advisor Class \| Bio-Techne Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Small Cap Growth Fund - Advisor Class \| Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	26.50%
Columbia Small Cap Growth Fund - Advisor Class \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.40%
Columbia Small Cap Growth Fund - Advisor Class \| Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.50%
Columbia Small Cap Growth Fund - Advisor Class \| Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.20%
Columbia Small Cap Growth Fund - Advisor Class \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.60%
Columbia Small Cap Growth Fund - Advisor Class \| Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%
Columbia Small Cap Growth Fund - Advisor Class \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%
Columbia Small Cap Growth Fund - Advisor Class \| Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Small Cap Growth Fund - Advisor Class \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Small Cap Growth Fund - Advisor Class \| Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Columbia Small Cap Growth Fund - Advisor Class \| Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.50%
Columbia Small Cap Growth Fund - Advisor Class \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Columbia Small Cap Growth Fund - Class C \| FTAI Aviation Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.10%
Columbia Small Cap Growth Fund - Class C \| Carpenter Technology Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Columbia Small Cap Growth Fund - Class C \| Onto Innovation, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Small Cap Growth Fund - Class C \| AAON, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Small Cap Growth Fund - Class C \| XPO, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Small Cap Growth Fund - Class C \| SiteOne Landscape Supply, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Small Cap Growth Fund - Class C \| Chemed Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Small Cap Growth Fund - Class C \| ICU Medical, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Small Cap Growth Fund - Class C \| RBC Bearings, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Small Cap Growth Fund - Class C \| Bio-Techne Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Small Cap Growth Fund - Class C \| Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	26.50%
Columbia Small Cap Growth Fund - Class C \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.40%
Columbia Small Cap Growth Fund - Class C \| Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.50%
Columbia Small Cap Growth Fund - Class C \| Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.20%
Columbia Small Cap Growth Fund - Class C \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.60%
Columbia Small Cap Growth Fund - Class C \| Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%
Columbia Small Cap Growth Fund - Class C \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%
Columbia Small Cap Growth Fund - Class C \| Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Small Cap Growth Fund - Class C \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Small Cap Growth Fund - Class C \| Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Columbia Small Cap Growth Fund - Class C \| Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.50%
Columbia Small Cap Growth Fund - Class C \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Columbia Small Cap Growth Fund - Institutional Class \| FTAI Aviation Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.10%
Columbia Small Cap Growth Fund - Institutional Class \| Carpenter Technology Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Columbia Small Cap Growth Fund - Institutional Class \| Onto Innovation, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Small Cap Growth Fund - Institutional Class \| AAON, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Small Cap Growth Fund - Institutional Class \| XPO, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Small Cap Growth Fund - Institutional Class \| SiteOne Landscape Supply, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Small Cap Growth Fund - Institutional Class \| Chemed Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Small Cap Growth Fund - Institutional Class \| ICU Medical, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Small Cap Growth Fund - Institutional Class \| RBC Bearings, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Small Cap Growth Fund - Institutional Class \| Bio-Techne Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Small Cap Growth Fund - Institutional Class \| Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	26.50%
Columbia Small Cap Growth Fund - Institutional Class \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.40%
Columbia Small Cap Growth Fund - Institutional Class \| Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.50%
Columbia Small Cap Growth Fund - Institutional Class \| Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.20%
Columbia Small Cap Growth Fund - Institutional Class \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.60%
Columbia Small Cap Growth Fund - Institutional Class \| Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%
Columbia Small Cap Growth Fund - Institutional Class \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%
Columbia Small Cap Growth Fund - Institutional Class \| Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Small Cap Growth Fund - Institutional Class \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Small Cap Growth Fund - Institutional Class \| Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Columbia Small Cap Growth Fund - Institutional Class \| Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.50%
Columbia Small Cap Growth Fund - Institutional Class \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Columbia Small Cap Growth Fund - Institutional 2 Class \| FTAI Aviation Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.10%
Columbia Small Cap Growth Fund - Institutional 2 Class \| Carpenter Technology Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Columbia Small Cap Growth Fund - Institutional 2 Class \| Onto Innovation, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Small Cap Growth Fund - Institutional 2 Class \| AAON, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Small Cap Growth Fund - Institutional 2 Class \| XPO, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Small Cap Growth Fund - Institutional 2 Class \| SiteOne Landscape Supply, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Small Cap Growth Fund - Institutional 2 Class \| Chemed Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Small Cap Growth Fund - Institutional 2 Class \| ICU Medical, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Small Cap Growth Fund - Institutional 2 Class \| RBC Bearings, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Small Cap Growth Fund - Institutional 2 Class \| Bio-Techne Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Small Cap Growth Fund - Institutional 2 Class \| Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	26.50%
Columbia Small Cap Growth Fund - Institutional 2 Class \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.40%
Columbia Small Cap Growth Fund - Institutional 2 Class \| Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.50%
Columbia Small Cap Growth Fund - Institutional 2 Class \| Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.20%
Columbia Small Cap Growth Fund - Institutional 2 Class \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.60%
Columbia Small Cap Growth Fund - Institutional 2 Class \| Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%
Columbia Small Cap Growth Fund - Institutional 2 Class \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%
Columbia Small Cap Growth Fund - Institutional 2 Class \| Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Small Cap Growth Fund - Institutional 2 Class \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Small Cap Growth Fund - Institutional 2 Class \| Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Columbia Small Cap Growth Fund - Institutional 2 Class \| Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.50%
Columbia Small Cap Growth Fund - Institutional 2 Class \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Columbia Small Cap Growth Fund - Institutional 3 Class \| FTAI Aviation Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.10%
Columbia Small Cap Growth Fund - Institutional 3 Class \| Carpenter Technology Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Columbia Small Cap Growth Fund - Institutional 3 Class \| Onto Innovation, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Small Cap Growth Fund - Institutional 3 Class \| AAON, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Small Cap Growth Fund - Institutional 3 Class \| XPO, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Small Cap Growth Fund - Institutional 3 Class \| SiteOne Landscape Supply, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Small Cap Growth Fund - Institutional 3 Class \| Chemed Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Small Cap Growth Fund - Institutional 3 Class \| ICU Medical, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Small Cap Growth Fund - Institutional 3 Class \| RBC Bearings, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Small Cap Growth Fund - Institutional 3 Class \| Bio-Techne Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Small Cap Growth Fund - Institutional 3 Class \| Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	26.50%
Columbia Small Cap Growth Fund - Institutional 3 Class \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.40%
Columbia Small Cap Growth Fund - Institutional 3 Class \| Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.50%
Columbia Small Cap Growth Fund - Institutional 3 Class \| Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.20%
Columbia Small Cap Growth Fund - Institutional 3 Class \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.60%
Columbia Small Cap Growth Fund - Institutional 3 Class \| Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%
Columbia Small Cap Growth Fund - Institutional 3 Class \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%
Columbia Small Cap Growth Fund - Institutional 3 Class \| Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Small Cap Growth Fund - Institutional 3 Class \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Small Cap Growth Fund - Institutional 3 Class \| Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Columbia Small Cap Growth Fund - Institutional 3 Class \| Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.50%
Columbia Small Cap Growth Fund - Institutional 3 Class \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Columbia Small Cap Growth Fund - Class R \| FTAI Aviation Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.10%
Columbia Small Cap Growth Fund - Class R \| Carpenter Technology Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Columbia Small Cap Growth Fund - Class R \| Onto Innovation, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Small Cap Growth Fund - Class R \| AAON, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Small Cap Growth Fund - Class R \| XPO, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Small Cap Growth Fund - Class R \| SiteOne Landscape Supply, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Small Cap Growth Fund - Class R \| Chemed Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Small Cap Growth Fund - Class R \| ICU Medical, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Small Cap Growth Fund - Class R \| RBC Bearings, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Small Cap Growth Fund - Class R \| Bio-Techne Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Small Cap Growth Fund - Class R \| Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	26.50%
Columbia Small Cap Growth Fund - Class R \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.40%
Columbia Small Cap Growth Fund - Class R \| Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.50%
Columbia Small Cap Growth Fund - Class R \| Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.20%
Columbia Small Cap Growth Fund - Class R \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.60%
Columbia Small Cap Growth Fund - Class R \| Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%
Columbia Small Cap Growth Fund - Class R \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%
Columbia Small Cap Growth Fund - Class R \| Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Small Cap Growth Fund - Class R \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Small Cap Growth Fund - Class R \| Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.80%
Columbia Small Cap Growth Fund - Class R \| Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.50%
Columbia Small Cap Growth Fund - Class R \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.90%