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 Select Mid Cap Growth Fund - Class A [Member]
Shareholder Report [Line Items]
Fund Name	Columbia Select Mid Cap Growth Fund
Class Name	Class A
Trading Symbol	CBSAX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Columbia Select Mid 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 $ 1.13 %
Expenses Paid, Amount	$ 122
Expense Ratio, Percent	1.13%
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. Allocations Individual holdings 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) 16.27 10.03 9.60 Class A (including sales charges) (a) 9.61 8.73 8.95 Russell ® 19.07 10.50 10.61 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	$ 1,541,448,107
Holdings Count \| Holding	71
Advisory Fees Paid, Amount	$ 11,506,515
Investment Company, Portfolio Turnover	174%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 71 Management services fees $ Portfolio turnover for the reporting period 174%
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 Ares Management Corp., Class A 3.2 % Trade Desk, Inc. (The), Class A 2.8 % Spotify Technology SA 2.8 % FTAI Aviation Ltd. 2.5 % XPO, Inc. 2.4 % Domino's Pizza, Inc. 2.3 % Datadog, Inc., Class A 2.3 % Burlington Stores, Inc. 2.2 % PulteGroup, Inc. 2.2 % Targa Resources Corp. 2.1 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Ares Management Corp., Class A 3.2 % Trade Desk, Inc. (The), Class A 2.8 % Spotify Technology SA 2.8 % FTAI Aviation Ltd. 2.5 % XPO, Inc. 2.4 % Domino's Pizza, Inc. 2.3 % Datadog, Inc., Class A 2.3 % Burlington Stores, Inc. 2.2 % PulteGroup, Inc. 2.2 % Targa Resources Corp. 2.1 %
Updated Prospectus Web Address	columbiathreadneedleus.com/investment-products/mutual-funds
Columbia Select Mid Cap Growth Fund - Advisor Class [Member]
Shareholder Report [Line Items]
Fund Name	Columbia Select Mid Cap Growth Fund
Class Name	Advisor Class
Trading Symbol	CPGRX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Columbia Select Mid 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 $ 0.88 %
Expenses Paid, Amount	$ 95
Expense Ratio, Percent	0.88%
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. Allocations Individual holdings 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) 16.58 10.31 9.88 Russell ® 19.07 10.50 10.61 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	$ 1,541,448,107
Holdings Count \| Holding	71
Advisory Fees Paid, Amount	$ 11,506,515
Investment Company, Portfolio Turnover	174%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 71 Management services fees $ Portfolio turnover for the reporting period 174%
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 Ares Management Corp., Class A 3.2 % Trade Desk, Inc. (The), Class A 2.8 % Spotify Technology SA 2.8 % FTAI Aviation Ltd. 2.5 % XPO, Inc. 2.4 % Domino's Pizza, Inc. 2.3 % Datadog, Inc., Class A 2.3 % Burlington Stores, Inc. 2.2 % PulteGroup, Inc. 2.2 % Targa Resources Corp. 2.1 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Ares Management Corp., Class A 3.2 % Trade Desk, Inc. (The), Class A 2.8 % Spotify Technology SA 2.8 % FTAI Aviation Ltd. 2.5 % XPO, Inc. 2.4 % Domino's Pizza, Inc. 2.3 % Datadog, Inc., Class A 2.3 % Burlington Stores, Inc. 2.2 % PulteGroup, Inc. 2.2 % Targa Resources Corp. 2.1 %
Updated Prospectus Web Address	columbiathreadneedleus.com/investment-products/mutual-funds
Columbia Select Mid Cap Growth Fund - Class C - [Member]
Shareholder Report [Line Items]
Fund Name	Columbia Select Mid Cap Growth Fund
Class Name	Class C
Trading Symbol	CMCCX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Columbia Select Mid 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 $ 1.88 %
Expenses Paid, Amount	$ 202
Expense Ratio, Percent	1.88%
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. Allocations Individual holdings 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) 15.41 9.21 8.78 Class C (including sales charges) (a) 14.41 9.21 8.78 Russell ® 19.07 10.50 10.61 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	$ 1,541,448,107
Holdings Count \| Holding	71
Advisory Fees Paid, Amount	$ 11,506,515
Investment Company, Portfolio Turnover	174%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 71 Management services fees $ Portfolio turnover for the reporting period 174%
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 Ares Management Corp., Class A 3.2 % Trade Desk, Inc. (The), Class A 2.8 % Spotify Technology SA 2.8 % FTAI Aviation Ltd. 2.5 % XPO, Inc. 2.4 % Domino's Pizza, Inc. 2.3 % Datadog, Inc., Class A 2.3 % Burlington Stores, Inc. 2.2 % PulteGroup, Inc. 2.2 % Targa Resources Corp. 2.1 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Ares Management Corp., Class A 3.2 % Trade Desk, Inc. (The), Class A 2.8 % Spotify Technology SA 2.8 % FTAI Aviation Ltd. 2.5 % XPO, Inc. 2.4 % Domino's Pizza, Inc. 2.3 % Datadog, Inc., Class A 2.3 % Burlington Stores, Inc. 2.2 % PulteGroup, Inc. 2.2 % Targa Resources Corp. 2.1 %
Updated Prospectus Web Address	columbiathreadneedleus.com/investment-products/mutual-funds
Columbia Select Mid Cap Growth Fund - Institutional Class [Member]
Shareholder Report [Line Items]
Fund Name	Columbia Select Mid Cap Growth Fund
Class Name	Institutional Class
Trading Symbol	CLSPX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Columbia Select Mid 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 $ 0.88 %
Expenses Paid, Amount	$ 95
Expense Ratio, Percent	0.88%
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. Allocations Individual holdings 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) 16.57 10.30 9.88 Russell ® 19.07 10.50 10.61 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	$ 1,541,448,107
Holdings Count \| Holding	71
Advisory Fees Paid, Amount	$ 11,506,515
Investment Company, Portfolio Turnover	174%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 71 Management services fees $ Portfolio turnover for the reporting period 174%
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 Ares Management Corp., Class A 3.2 % Trade Desk, Inc. (The), Class A 2.8 % Spotify Technology SA 2.8 % FTAI Aviation Ltd. 2.5 % XPO, Inc. 2.4 % Domino's Pizza, Inc. 2.3 % Datadog, Inc., Class A 2.3 % Burlington Stores, Inc. 2.2 % PulteGroup, Inc. 2.2 % Targa Resources Corp. 2.1 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Ares Management Corp., Class A 3.2 % Trade Desk, Inc. (The), Class A 2.8 % Spotify Technology SA 2.8 % FTAI Aviation Ltd. 2.5 % XPO, Inc. 2.4 % Domino's Pizza, Inc. 2.3 % Datadog, Inc., Class A 2.3 % Burlington Stores, Inc. 2.2 % PulteGroup, Inc. 2.2 % Targa Resources Corp. 2.1 %
Updated Prospectus Web Address	columbiathreadneedleus.com/investment-products/mutual-funds
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member]
Shareholder Report [Line Items]
Fund Name	Columbia Select Mid Cap Growth Fund
Class Name	Institutional 2 Class
Trading Symbol	CMGVX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Columbia Select Mid 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
Material Fund Change Notice [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 $ 0.82 %
Expenses Paid, Amount	$ 89
Expense Ratio, Percent	0.82%
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. Allocations Individual holdings 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) 16.62 10.36 9.96 Russell ® 19.07 10.50 10.61 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	$ 1,541,448,107
Holdings Count \| Holding	71
Advisory Fees Paid, Amount	$ 11,506,515
Investment Company, Portfolio Turnover	174%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 71 Management services fees $ Portfolio turnover for the reporting period 174%
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 Ares Management Corp., Class A 3.2 % Trade Desk, Inc. (The), Class A 2.8 % Spotify Technology SA 2.8 % FTAI Aviation Ltd. 2.5 % XPO, Inc. 2.4 % Domino's Pizza, Inc. 2.3 % Datadog, Inc., Class A 2.3 % Burlington Stores, Inc. 2.2 % PulteGroup, Inc. 2.2 % Targa Resources Corp. 2.1 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Ares Management Corp., Class A 3.2 % Trade Desk, Inc. (The), Class A 2.8 % Spotify Technology SA 2.8 % FTAI Aviation Ltd. 2.5 % XPO, Inc. 2.4 % Domino's Pizza, Inc. 2.3 % Datadog, Inc., Class A 2.3 % Burlington Stores, Inc. 2.2 % PulteGroup, Inc. 2.2 % Targa Resources Corp. 2.1 %
Updated Prospectus Web Address	columbiathreadneedleus.com/investment-products/mutual-funds
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member]
Shareholder Report [Line Items]
Fund Name	Columbia Select Mid Cap Growth Fund
Class Name	Institutional 3 Class
Trading Symbol	CMGYX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Columbia Select Mid 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 3 Class $ 0.78 %
Expenses Paid, Amount	$ 84
Expense Ratio, Percent	0.78%
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. Allocations Individual holdings 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) 16.71 10.42 10.02 Russell ® 19.07 10.50 10.61 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	$ 1,541,448,107
Holdings Count \| Holding	71
Advisory Fees Paid, Amount	$ 11,506,515
Investment Company, Portfolio Turnover	174%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 71 Management services fees $ Portfolio turnover for the reporting period 174%
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 Ares Management Corp., Class A 3.2 % Trade Desk, Inc. (The), Class A 2.8 % Spotify Technology SA 2.8 % FTAI Aviation Ltd. 2.5 % XPO, Inc. 2.4 % Domino's Pizza, Inc. 2.3 % Datadog, Inc., Class A 2.3 % Burlington Stores, Inc. 2.2 % PulteGroup, Inc. 2.2 % Targa Resources Corp. 2.1 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Ares Management Corp., Class A 3.2 % Trade Desk, Inc. (The), Class A 2.8 % Spotify Technology SA 2.8 % FTAI Aviation Ltd. 2.5 % XPO, Inc. 2.4 % Domino's Pizza, Inc. 2.3 % Datadog, Inc., Class A 2.3 % Burlington Stores, Inc. 2.2 % PulteGroup, Inc. 2.2 % Targa Resources Corp. 2.1 %
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 Select Mid Cap Growth Fund - Institutional 3 Class [Member]
Account Value [Line Items]
Line Graph and Table Measure Name	Institutional 3 Class
Account Value	$ 25,983	$ 22,263	$ 19,905	$ 27,921	$ 20,116	$ 15,831	$ 15,343	$ 12,509	$ 10,930	$ 10,583	$ 10,000
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member]
Account Value [Line Items]
Line Graph and Table Measure Name	Institutional 2 Class
Account Value	$ 25,834	22,151	19,817	27,812	20,047	15,779	15,304	12,483	10,912	10,572	10,000
Columbia Select Mid Cap Growth Fund - Institutional Class [Member]
Account Value [Line Items]
Line Graph and Table Measure Name	Institutional Class
Account Value	$ 25,646	22,000	19,688	27,644	19,936	15,707	15,239	12,441	10,885	10,558	10,000
Columbia Select Mid Cap Growth Fund - Class C - [Member]
Account Value [Line Items]
Line Graph and Table Measure Name	Class C (including sales charges)
Account Value	$ 23,200	20,102	18,167	25,768	18,771	14,936	14,639	12,071	10,671	10,456	10,000
Columbia Select Mid Cap Growth Fund - Advisor Class [Member]
Account Value [Line Items]
Line Graph and Table Measure Name	Advisor Class
Account Value	$ 25,650	22,002	19,689	27,648	19,941	15,707	15,238	12,439	10,888	10,561	10,000
Columbia Select Mid Cap Growth Fund - Class A [Member]
Account Value [Line Items]
Line Graph and Table Measure Name	Class A (including sales charges)
Account Value	$ 23,571	20,272	18,185	25,603	18,514	14,617	14,222	11,635	10,209	9,927	9,425
Russell Midcap Growth Index [Member]
Account Value [Line Items]
Line Graph and Table Measure Name	Russell® Midcap Growth Index
Account Value	$ 27,408	23,019	20,371	27,788	20,557	16,638	15,702	12,555	10,963	10,246	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 Select Mid Cap Growth Fund - Institutional 3 Class [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Institutional 3 Class
Average Annual Return, Percent	[1]	16.71%	10.42%	10.02%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Institutional 2 Class
Average Annual Return, Percent	[1]	16.62%	10.36%	9.96%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Institutional Class
Average Annual Return, Percent	[1]	16.57%	10.30%	9.88%
Columbia Select Mid Cap Growth Fund - Class C - [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Class C (including sales charges)
Average Annual Return, Percent	[1]	14.41%	9.21%	8.78%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Advisor Class
Average Annual Return, Percent	[1]	16.58%	10.31%	9.88%
Columbia Select Mid Cap Growth Fund - Class A [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Class A (including sales charges)
Average Annual Return, Percent	[1]	9.61%	8.73%	8.95%
Without Sales Load [Member] \| Columbia Select Mid Cap Growth Fund - Class C - [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Class C (excluding sales charges)
Average Annual Return, Percent	[1]	15.41%	9.21%	8.78%
Without Sales Load [Member] \| Columbia Select Mid Cap Growth Fund - Class A [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Class A (excluding sales charges)
Average Annual Return, Percent	[1]	16.27%	10.03%	9.60%
Russell Midcap Growth Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Russell® Midcap Growth Index
Average Annual Return, Percent		19.07%	10.50%	10.61%
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 benchmarks, which more closely represent 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 Select Mid Cap Growth Fund - Class A [Member] \| Ares Management Corp., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%
Columbia Select Mid Cap Growth Fund - Class A [Member] \| Trade Desk, Inc. (The), Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Select Mid Cap Growth Fund - Class A [Member] \| Spotify Technology SA [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Select Mid Cap Growth Fund - Class A [Member] \| FTAI Aviation Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Select Mid Cap Growth Fund - Class A [Member] \| XPO, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Select Mid Cap Growth Fund - Class A [Member] \| Domino's Pizza, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Select Mid Cap Growth Fund - Class A [Member] \| Datadog, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Select Mid Cap Growth Fund - Class A [Member] \| Burlington Stores, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Select Mid Cap Growth Fund - Class A [Member] \| PulteGroup, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Select Mid Cap Growth Fund - Class A [Member] \| Targa Resources Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Select Mid Cap Growth Fund - Class A [Member] \| Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	21%
Columbia Select Mid Cap Growth Fund - Class A [Member] \| Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	18%
Columbia Select Mid Cap Growth Fund - Class A [Member] \| Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.20%
Columbia Select Mid Cap Growth Fund - Class A [Member] \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.10%
Columbia Select Mid Cap Growth Fund - Class A [Member] \| Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.20%
Columbia Select Mid Cap Growth Fund - Class A [Member] \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.70%
Columbia Select Mid Cap Growth Fund - Class A [Member] \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.40%
Columbia Select Mid Cap Growth Fund - Class A [Member] \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Select Mid Cap Growth Fund - Class A [Member] \| Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Select Mid Cap Growth Fund - Class A [Member] \| Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Select Mid Cap Growth Fund - Class A [Member] \| Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Columbia Select Mid Cap Growth Fund - Class A [Member] \| Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	98.70%
Columbia Select Mid Cap Growth Fund - Class A [Member] \| Money Market Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.60%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member] \| Ares Management Corp., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member] \| Trade Desk, Inc. (The), Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member] \| Spotify Technology SA [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member] \| FTAI Aviation Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member] \| XPO, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member] \| Domino's Pizza, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member] \| Datadog, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member] \| Burlington Stores, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member] \| PulteGroup, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member] \| Targa Resources Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member] \| Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	21%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member] \| Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	18%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member] \| Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.20%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member] \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.10%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member] \| Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.20%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member] \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.70%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member] \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.40%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member] \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member] \| Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member] \| Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member] \| Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member] \| Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	98.70%
Columbia Select Mid Cap Growth Fund - Advisor Class [Member] \| Money Market Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.60%
Columbia Select Mid Cap Growth Fund - Class C - [Member] \| Ares Management Corp., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%
Columbia Select Mid Cap Growth Fund - Class C - [Member] \| Trade Desk, Inc. (The), Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Select Mid Cap Growth Fund - Class C - [Member] \| Spotify Technology SA [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Select Mid Cap Growth Fund - Class C - [Member] \| FTAI Aviation Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Select Mid Cap Growth Fund - Class C - [Member] \| XPO, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Select Mid Cap Growth Fund - Class C - [Member] \| Domino's Pizza, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Select Mid Cap Growth Fund - Class C - [Member] \| Datadog, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Select Mid Cap Growth Fund - Class C - [Member] \| Burlington Stores, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Select Mid Cap Growth Fund - Class C - [Member] \| PulteGroup, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Select Mid Cap Growth Fund - Class C - [Member] \| Targa Resources Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Select Mid Cap Growth Fund - Class C - [Member] \| Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	21%
Columbia Select Mid Cap Growth Fund - Class C - [Member] \| Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	18%
Columbia Select Mid Cap Growth Fund - Class C - [Member] \| Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.20%
Columbia Select Mid Cap Growth Fund - Class C - [Member] \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.10%
Columbia Select Mid Cap Growth Fund - Class C - [Member] \| Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.20%
Columbia Select Mid Cap Growth Fund - Class C - [Member] \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.70%
Columbia Select Mid Cap Growth Fund - Class C - [Member] \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.40%
Columbia Select Mid Cap Growth Fund - Class C - [Member] \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Select Mid Cap Growth Fund - Class C - [Member] \| Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Select Mid Cap Growth Fund - Class C - [Member] \| Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Select Mid Cap Growth Fund - Class C - [Member] \| Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Columbia Select Mid Cap Growth Fund - Class C - [Member] \| Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	98.70%
Columbia Select Mid Cap Growth Fund - Class C - [Member] \| Money Market Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.60%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member] \| Ares Management Corp., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member] \| Trade Desk, Inc. (The), Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member] \| Spotify Technology SA [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member] \| FTAI Aviation Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member] \| XPO, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member] \| Domino's Pizza, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member] \| Datadog, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member] \| Burlington Stores, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member] \| PulteGroup, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member] \| Targa Resources Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member] \| Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	21%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member] \| Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	18%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member] \| Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.20%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member] \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.10%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member] \| Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.20%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member] \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.70%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member] \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.40%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member] \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member] \| Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member] \| Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member] \| Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member] \| Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	98.70%
Columbia Select Mid Cap Growth Fund - Institutional Class [Member] \| Money Market Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.60%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member] \| Ares Management Corp., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member] \| Trade Desk, Inc. (The), Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member] \| Spotify Technology SA [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member] \| FTAI Aviation Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member] \| XPO, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member] \| Domino's Pizza, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member] \| Datadog, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member] \| Burlington Stores, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member] \| PulteGroup, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member] \| Targa Resources Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member] \| Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	21%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member] \| Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	18%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member] \| Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.20%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member] \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.10%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member] \| Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.20%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member] \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.70%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member] \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.40%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member] \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member] \| Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member] \| Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member] \| Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member] \| Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	98.70%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class [Member] \| Money Market Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.60%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member] \| Ares Management Corp., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member] \| Trade Desk, Inc. (The), Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member] \| Spotify Technology SA [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member] \| FTAI Aviation Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member] \| XPO, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member] \| Domino's Pizza, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member] \| Datadog, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member] \| Burlington Stores, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member] \| PulteGroup, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member] \| Targa Resources Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member] \| Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	21%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member] \| Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	18%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member] \| Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.20%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member] \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	13.10%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member] \| Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.20%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member] \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.70%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member] \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.40%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member] \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member] \| Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member] \| Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member] \| Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member] \| Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	98.70%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class [Member] \| Money Market Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.60%