Columbia Thermostat Fund (CTFAX) N-CSRS 5 Sep 24 Certified semi-annual shareholder report (management investment company) Financial data

Form N-CSR Cover

Form N-CSR Cover	6 Months Ended
	Jun. 30, 2024
Shareholder Report [Line Items]
Document Type	N-CSRS
Amendment Flag	false
Registrant Name	Columbia Acorn Trust
Entity Central Index Key	0000002110
Entity Investment Company Type	N-1A
Document Period End Date	Jun. 30, 2024

Shareholder Report

Shareholder Report	6 Months Ended
	Jun. 30, 2024 USD ($) Holding
Shareholder Report [Line Items]
Document Type	N-CSRS
Amendment Flag	false
Registrant Name	Columbia Acorn Trust
Entity Central Index Key	0000002110
Entity Investment Company Type	N-1A
Document Period End Date	Jun. 30, 2024
Columbia Acorn® Fund Class A
Shareholder Report [Line Items]
Fund Name	Columbia Acorn® Fund
Class Name	Class A
Trading Symbol	LACAX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report ®
Shareholder Report Annual or Semi-Annual	Semi - Annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at c olumbiathreadneedleus.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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $ 1.08 %
Expenses Paid, Amount	$ 54
Expense Ratio, Percent	1.08%
Net Assets	$ 2,664,444,631
Holdings Count | Holding	103
Investment Company, Portfolio Turnover	40%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings $ Portfolio turnover for the reporting period $
Holdings [Text Block]	Graphical Representation of Fund The tables below show the investment makeup of the Fund represented as a percentage Fund Derivatives otherwise Top Holdings Churchill Downs, Inc. 3.0% SPX Technologies, Inc. 2.4% Bio-Techne Corp. 2.4% Five Below, Inc. 2.3% BJ's Wholesale Club Holdings, Inc. 2.1% Parsons Corp. 2.1% Natera, Inc. 2.0% Colliers International Group, Inc. 2.0% Ryan Specialty Holdings, Inc., Class A 2.0% WillScot Mobile Mini Holdings Corp. 2.0% Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Churchill Downs, Inc. 3.0% SPX Technologies, Inc. 2.4% Bio-Techne Corp. 2.4% Five Below, Inc. 2.3% BJ's Wholesale Club Holdings, Inc. 2.1% Parsons Corp. 2.1% Natera, Inc. 2.0% Colliers International Group, Inc. 2.0% Ryan Specialty Holdings, Inc., Class A 2.0% WillScot Mobile Mini Holdings Corp. 2.0%
Columbia Acorn® Fund Advisor Class
Shareholder Report [Line Items]
Fund Name	Columbia Acorn® Fund
Class Name	Advisor Class
Trading Symbol	CEARX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report ®
Shareholder Report Annual or Semi-Annual	Semi - Annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature 1-800-345-6611.
Additional Information Phone Number	1-800-345-6611
Additional Information Website	olumbiathreadneedleus.com/resources/literature
Expenses [Text Block]	What were the Fund costs for the reporting period? (Based on a hypothetical $10,000 investment) Class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Advisor Class $ 0.83 %
Expenses Paid, Amount	$ 42
Expense Ratio, Percent	0.83%
Net Assets	$ 2,664,444,631
Holdings Count | Holding	103
Investment Company, Portfolio Turnover	40%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings $ Portfolio turnover for the reporting period $
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 Top Holdings Churchill Downs, Inc. 3.0% SPX Technologies, Inc. 2.4% Bio-Techne Corp. 2.4% Five Below, Inc. 2.3% BJ's Wholesale Club Holdings, Inc. 2.1% Parsons Corp. 2.1% Natera, Inc. 2.0% Colliers International Group, Inc. 2.0% Ryan Specialty Holdings, Inc., Class A 2.0% WillScot Mobile Mini Holdings Corp. 2.0% Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Churchill Downs, Inc. 3.0% SPX Technologies, Inc. 2.4% Bio-Techne Corp. 2.4% Five Below, Inc. 2.3% BJ's Wholesale Club Holdings, Inc. 2.1% Parsons Corp. 2.1% Natera, Inc. 2.0% Colliers International Group, Inc. 2.0% Ryan Specialty Holdings, Inc., Class A 2.0% WillScot Mobile Mini Holdings Corp. 2.0%
Columbia Acorn® Fund Class C
Shareholder Report [Line Items]
Fund Name	Columbia Acorn® Fund
Class Name	Class C
Trading Symbol	LIACX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report ®
Shareholder Report Annual or Semi-Annual	Semi - Annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature. You can also request more information by contacting us at 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 (Based on a hypothetical $10,000 investment) Class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $ 1.83 %
Expenses Paid, Amount	$ 92
Expense Ratio, Percent	1.83%
Net Assets	$ 2,664,444,631
Holdings Count | Holding	103
Investment Company, Portfolio Turnover	40%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings $ Portfolio turnover for the reporting period $
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 subject Top Holdings Churchill Downs, Inc. 3.0% SPX Technologies, Inc. 2.4% Bio-Techne Corp. 2.4% Five Below, Inc. 2.3% BJ's Wholesale Club Holdings, Inc. 2.1% Parsons Corp. 2.1% Natera, Inc. 2.0% Colliers International Group, Inc. 2.0% Ryan Specialty Holdings, Inc., Class A 2.0% WillScot Mobile Mini Holdings Corp. 2.0% Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Churchill Downs, Inc. 3.0% SPX Technologies, Inc. 2.4% Bio-Techne Corp. 2.4% Five Below, Inc. 2.3% BJ's Wholesale Club Holdings, Inc. 2.1% Parsons Corp. 2.1% Natera, Inc. 2.0% Colliers International Group, Inc. 2.0% Ryan Specialty Holdings, Inc., Class A 2.0% WillScot Mobile Mini Holdings Corp. 2.0%
Columbia Acorn® Fund Institutional Class
Shareholder Report [Line Items]
Fund Name	Columbia Acorn® Fund
Class Name	Institutional Class
Trading Symbol	ACRNX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report ®
Shareholder Report Annual or Semi-Annual	Semi - Annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature. You can also request more information by contacting us at 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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $ 0.83 %
Expenses Paid, Amount	$ 42
Expense Ratio, Percent	0.83%
Net Assets	$ 2,664,444,631
Holdings Count | Holding	103
Investment Company, Portfolio Turnover	40%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings $ Portfolio turnover for the reporting period $
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 Top Holdings Churchill Downs, Inc. 3.0% SPX Technologies, Inc. 2.4% Bio-Techne Corp. 2.4% Five Below, Inc. 2.3% BJ's Wholesale Club Holdings, Inc. 2.1% Parsons Corp. 2.1% Natera, Inc. 2.0% Colliers International Group, Inc. 2.0% Ryan Specialty Holdings, Inc., Class A 2.0% WillScot Mobile Mini Holdings Corp. 2.0% Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Churchill Downs, Inc. 3.0% SPX Technologies, Inc. 2.4% Bio-Techne Corp. 2.4% Five Below, Inc. 2.3% BJ's Wholesale Club Holdings, Inc. 2.1% Parsons Corp. 2.1% Natera, Inc. 2.0% Colliers International Group, Inc. 2.0% Ryan Specialty Holdings, Inc., Class A 2.0% WillScot Mobile Mini Holdings Corp. 2.0%
Columbia Acorn® Fund Institutional 2 Class
Shareholder Report [Line Items]
Fund Name	Columbia Acorn® Fund
Class Name	Institutional 2 Class
Trading Symbol	CRBRX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report ®
Shareholder Report Annual or Semi-Annual	Semi - Annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature. You can also request more information by contacting us at 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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional 2 Class $ 0.80 %
Expenses Paid, Amount	$ 40
Expense Ratio, Percent	0.80%
Net Assets	$ 2,664,444,631
Holdings Count | Holding	103
Investment Company, Portfolio Turnover	40%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings $ Portfolio turnover for the reporting period $
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 subject Top Holdings Churchill Downs, Inc. 3.0% SPX Technologies, Inc. 2.4% Bio-Techne Corp. 2.4% Five Below, Inc. 2.3% BJ's Wholesale Club Holdings, Inc. 2.1% Parsons Corp. 2.1% Natera, Inc. 2.0% Colliers International Group, Inc. 2.0% Ryan Specialty Holdings, Inc., Class A 2.0% WillScot Mobile Mini Holdings Corp. 2.0% Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Churchill Downs, Inc. 3.0% SPX Technologies, Inc. 2.4% Bio-Techne Corp. 2.4% Five Below, Inc. 2.3% BJ's Wholesale Club Holdings, Inc. 2.1% Parsons Corp. 2.1% Natera, Inc. 2.0% Colliers International Group, Inc. 2.0% Ryan Specialty Holdings, Inc., Class A 2.0% WillScot Mobile Mini Holdings Corp. 2.0%
Columbia Acorn® Fund Institutional 3 Class
Shareholder Report [Line Items]
Fund Name	Columbia Acorn® Fund
Class Name	Institutional 3 Class
Trading Symbol	CRBYX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report ®
Shareholder Report Annual or Semi-Annual	Semi - Annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature. You can also request more information by contacting us at 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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional 3 Class $ 0.75 %
Expenses Paid, Amount	$ 38
Expense Ratio, Percent	0.75%
Net Assets	$ 2,664,444,631
Holdings Count | Holding	103
Investment Company, Portfolio Turnover	40%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings $ Portfolio turnover for the reporting period $
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 Top Holdings Churchill Downs, Inc. 3.0% SPX Technologies, Inc. 2.4% Bio-Techne Corp. 2.4% Five Below, Inc. 2.3% BJ's Wholesale Club Holdings, Inc. 2.1% Parsons Corp. 2.1% Natera, Inc. 2.0% Colliers International Group, Inc. 2.0% Ryan Specialty Holdings, Inc., Class A 2.0% WillScot Mobile Mini Holdings Corp. 2.0% Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Churchill Downs, Inc. 3.0% SPX Technologies, Inc. 2.4% Bio-Techne Corp. 2.4% Five Below, Inc. 2.3% BJ's Wholesale Club Holdings, Inc. 2.1% Parsons Corp. 2.1% Natera, Inc. 2.0% Colliers International Group, Inc. 2.0% Ryan Specialty Holdings, Inc., Class A 2.0% WillScot Mobile Mini Holdings Corp. 2.0%
Columbia Acorn International® Class A
Shareholder Report [Line Items]
Fund Name	Columbia Acorn International®
Class Name	Class A
Trading Symbol	LAIAX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report ®
Shareholder Report Annual or Semi-Annual	Semi - Annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature. You can also request more information by contacting us at 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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $ 1.23 %
Expenses Paid, Amount	$ 62
Expense Ratio, Percent	1.23%
Net Assets	$ 1,051,504,186
Holdings Count | Holding	77
Investment Company, Portfolio Turnover	5%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings $ Portfolio turnover for the reporting period $
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 Belimo Holding AG, Registered Shares 2.9% Recruit Holdings Co., Ltd. 2.7% Hexagon AB, Class B 2.4% Intermediate Capital Group PLC 2.4% Hypoport SE 2.3% Auto Trader Group PLC 2.3% Pro Medicus Ltd. 2.3% Munters Group AB 2.3% IMCD NV 2.2% CCL Industries, Inc., Class B 2.1% Equity Sector Allocation Geographic Allocation
Largest Holdings [Text Block]	Top Holdings Belimo Holding AG, Registered Shares 2.9% Recruit Holdings Co., Ltd. 2.7% Hexagon AB, Class B 2.4% Intermediate Capital Group PLC 2.4% Hypoport SE 2.3% Auto Trader Group PLC 2.3% Pro Medicus Ltd. 2.3% Munters Group AB 2.3% IMCD NV 2.2% CCL Industries, Inc., Class B 2.1%
Columbia Acorn International® Advisor Class
Shareholder Report [Line Items]
Fund Name	Columbia Acorn International®
Class Name	Advisor Class
Trading Symbol	CCIRX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report ®
Shareholder Report Annual or Semi-Annual	Semi - Annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature. You can also request more information by contacting us at 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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Advisor Class $ 0.98 %
Expenses Paid, Amount	$ 49
Expense Ratio, Percent	0.98%
Net Assets	$ 1,051,504,186
Holdings Count | Holding	77
Investment Company, Portfolio Turnover	5%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings $ Portfolio turnover for the reporting period $
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 Belimo Holding AG, Registered Shares 2.9% Recruit Holdings Co., Ltd. 2.7% Hexagon AB, Class B 2.4% Intermediate Capital Group PLC 2.4% Hypoport SE 2.3% Auto Trader Group PLC 2.3% Pro Medicus Ltd. 2.3% Munters Group AB 2.3% IMCD NV 2.2% CCL Industries, Inc., Class B 2.1% Equity Sector Allocation Geographic Allocation
Largest Holdings [Text Block]	Top Holdings Belimo Holding AG, Registered Shares 2.9% Recruit Holdings Co., Ltd. 2.7% Hexagon AB, Class B 2.4% Intermediate Capital Group PLC 2.4% Hypoport SE 2.3% Auto Trader Group PLC 2.3% Pro Medicus Ltd. 2.3% Munters Group AB 2.3% IMCD NV 2.2% CCL Industries, Inc., Class B 2.1%
Columbia Acorn International® Institutional Class
Shareholder Report [Line Items]
Fund Name	Columbia Acorn International®
Class Name	Institutional Class
Trading Symbol	ACINX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report ®
Shareholder Report Annual or Semi-Annual	Semi - Annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at 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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $ 0.98 %
Expenses Paid, Amount	$ 49
Expense Ratio, Percent	0.98%
Net Assets	$ 1,051,504,186
Holdings Count | Holding	77
Investment Company, Portfolio Turnover	5%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings $ Portfolio turnover for the reporting period $
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 Belimo Holding AG, Registered Shares 2.9% Recruit Holdings Co., Ltd. 2.7% Hexagon AB, Class B 2.4% Intermediate Capital Group PLC 2.4% Hypoport SE 2.3% Auto Trader Group PLC 2.3% Pro Medicus Ltd. 2.3% Munters Group AB 2.3% IMCD NV 2.2% CCL Industries, Inc., Class B 2.1% Equity Sector Allocation Geographic Allocation
Largest Holdings [Text Block]	Top Holdings Belimo Holding AG, Registered Shares 2.9% Recruit Holdings Co., Ltd. 2.7% Hexagon AB, Class B 2.4% Intermediate Capital Group PLC 2.4% Hypoport SE 2.3% Auto Trader Group PLC 2.3% Pro Medicus Ltd. 2.3% Munters Group AB 2.3% IMCD NV 2.2% CCL Industries, Inc., Class B 2.1%
Columbia Acorn International® Institutional 2 Class
Shareholder Report [Line Items]
Fund Name	Columbia Acorn International®
Class Name	Institutional 2 Class
Trading Symbol	CAIRX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report ®
Shareholder Report Annual or Semi-Annual	Semi - Annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature. You can also request more information by contacting us at 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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional 2 Class $ 0.92 %
Expenses Paid, Amount	$ 46
Expense Ratio, Percent	0.92%
Net Assets	$ 1,051,504,186
Holdings Count | Holding	77
Investment Company, Portfolio Turnover	5%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings $ Portfolio turnover for the reporting period $
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 Belimo Holding AG, Registered Shares 2.9% Recruit Holdings Co., Ltd. 2.7% Hexagon AB, Class B 2.4% Intermediate Capital Group PLC 2.4% Hypoport SE 2.3% Auto Trader Group PLC 2.3% Pro Medicus Ltd. 2.3% Munters Group AB 2.3% IMCD NV 2.2% CCL Industries, Inc., Class B 2.1% Equity Sector Allocation Geographic Allocation
Largest Holdings [Text Block]	Top Holdings Belimo Holding AG, Registered Shares 2.9% Recruit Holdings Co., Ltd. 2.7% Hexagon AB, Class B 2.4% Intermediate Capital Group PLC 2.4% Hypoport SE 2.3% Auto Trader Group PLC 2.3% Pro Medicus Ltd. 2.3% Munters Group AB 2.3% IMCD NV 2.2% CCL Industries, Inc., Class B 2.1%
Columbia Acorn International® Institutional 3 Class
Shareholder Report [Line Items]
Fund Name	Columbia Acorn International®
Class Name	Institutional 3 Class
Trading Symbol	CCYIX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report ®
Shareholder Report Annual or Semi-Annual	Semi - Annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature. You can also request more information by contacting us at 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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional 3 Class $ 0.88 %
Expenses Paid, Amount	$ 44
Expense Ratio, Percent	0.88%
Net Assets	$ 1,051,504,186
Holdings Count | Holding	77
Investment Company, Portfolio Turnover	5%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings $ Portfolio turnover for the reporting period $
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 Belimo Holding AG, Registered Shares 2.9% Recruit Holdings Co., Ltd. 2.7% Hexagon AB, Class B 2.4% Intermediate Capital Group PLC 2.4% Hypoport SE 2.3% Auto Trader Group PLC 2.3% Pro Medicus Ltd. 2.3% Munters Group AB 2.3% IMCD NV 2.2% CCL Industries, Inc., Class B 2.1% Equity Sector Allocation Geographic Allocation
Largest Holdings [Text Block]	Top Holdings Belimo Holding AG, Registered Shares 2.9% Recruit Holdings Co., Ltd. 2.7% Hexagon AB, Class B 2.4% Intermediate Capital Group PLC 2.4% Hypoport SE 2.3% Auto Trader Group PLC 2.3% Pro Medicus Ltd. 2.3% Munters Group AB 2.3% IMCD NV 2.2% CCL Industries, Inc., Class B 2.1%
Columbia Acorn International SelectSM Class A
Shareholder Report [Line Items]
Fund Name	Columbia Acorn International SelectSM
Class Name	Class A
Trading Symbol	LAFAX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report SM
Shareholder Report Annual or Semi-Annual	Semi - Annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature. You can also request more information by contacting us at 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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $ 1.23 %
Expenses Paid, Amount	$ 62
Expense Ratio, Percent	1.23%
Net Assets	$ 214,450,418
Holdings Count | Holding	68
Investment Company, Portfolio Turnover	62%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings $ Portfolio turnover for the reporting period $
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 Novo Nordisk A/S 4.0% Schneider Electric SE 3.1% ASML Holding NV 3.0% Renesas Electronics Corp. 2.8% 3i Group PLC 2.7% Adidas AG 2.6% Capcom Co., Ltd. 2.6% Recruit Holdings Co., Ltd. 2.6% Nestlé SA, Registered Shares 2.2% Publicis Groupe SA 2.2% Equity Sector Allocation Geographic Allocation
Largest Holdings [Text Block]	Top Holdings Novo Nordisk A/S 4.0% Schneider Electric SE 3.1% ASML Holding NV 3.0% Renesas Electronics Corp. 2.8% 3i Group PLC 2.7% Adidas AG 2.6% Capcom Co., Ltd. 2.6% Recruit Holdings Co., Ltd. 2.6% Nestlé SA, Registered Shares 2.2% Publicis Groupe SA 2.2%
Columbia Acorn International SelectSM Advisor Class
Shareholder Report [Line Items]
Fund Name	Columbia Acorn International SelectSM
Class Name	Advisor Class
Trading Symbol	CILRX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report SM
Shareholder Report Annual or Semi-Annual	Semi - 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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Advisor Class $ 0.98 %
Expenses Paid, Amount	$ 50
Expense Ratio, Percent	0.98%
Net Assets	$ 214,450,418
Holdings Count | Holding	68
Investment Company, Portfolio Turnover	62%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings $ Portfolio turnover for the reporting period $
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 Novo Nordisk A/S 4.0% Schneider Electric SE 3.1% ASML Holding NV 3.0% Renesas Electronics Corp. 2.8% 3i Group PLC 2.7% Adidas AG 2.6% Capcom Co., Ltd. 2.6% Recruit Holdings Co., Ltd. 2.6% Nestlé SA, Registered Shares 2.2% Publicis Groupe SA 2.2% Equity Sector Allocation Geographic Allocation
Largest Holdings [Text Block]	Top Holdings Novo Nordisk A/S 4.0% Schneider Electric SE 3.1% ASML Holding NV 3.0% Renesas Electronics Corp. 2.8% 3i Group PLC 2.7% Adidas AG 2.6% Capcom Co., Ltd. 2.6% Recruit Holdings Co., Ltd. 2.6% Nestlé SA, Registered Shares 2.2% Publicis Groupe SA 2.2%
Columbia Acorn International SelectSM Institutional Class
Shareholder Report [Line Items]
Fund Name	Columbia Acorn International SelectSM
Class Name	Institutional Class
Trading Symbol	ACFFX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report SM
Shareholder Report Annual or Semi-Annual	Semi - Annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature. You can also request more information by contacting us at 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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $ 0.98 %
Expenses Paid, Amount	$ 50
Expense Ratio, Percent	0.98%
Net Assets	$ 214,450,418
Holdings Count | Holding	68
Investment Company, Portfolio Turnover	62%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings $ Portfolio turnover for the reporting period $
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 Novo Nordisk A/S 4.0% Schneider Electric SE 3.1% ASML Holding NV 3.0% Renesas Electronics Corp. 2.8% 3i Group PLC 2.7% Adidas AG 2.6% Capcom Co., Ltd. 2.6% Recruit Holdings Co., Ltd. 2.6% Nestlé SA, Registered Shares 2.2% Publicis Groupe SA 2.2% Equity Sector Allocation Geographic Allocation
Largest Holdings [Text Block]	Top Holdings Novo Nordisk A/S 4.0% Schneider Electric SE 3.1% ASML Holding NV 3.0% Renesas Electronics Corp. 2.8% 3i Group PLC 2.7% Adidas AG 2.6% Capcom Co., Ltd. 2.6% Recruit Holdings Co., Ltd. 2.6% Nestlé SA, Registered Shares 2.2% Publicis Groupe SA 2.2%
Columbia Acorn International SelectSM Institutional 2 Class
Shareholder Report [Line Items]
Fund Name	Columbia Acorn International SelectSM
Class Name	Institutional 2 Class
Trading Symbol	CRIRX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report SM
Shareholder Report Annual or Semi-Annual	Semi - Annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature. You can also request more information by contacting us at 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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional 2 Class $ 0.84 %
Expenses Paid, Amount	$ 43
Expense Ratio, Percent	0.84%
Net Assets	$ 214,450,418
Holdings Count | Holding	68
Investment Company, Portfolio Turnover	62%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings $ Portfolio turnover for the reporting period $
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 Novo Nordisk A/S 4.0% Schneider Electric SE 3.1% ASML Holding NV 3.0% Renesas Electronics Corp. 2.8% 3i Group PLC 2.7% Adidas AG 2.6% Capcom Co., Ltd. 2.6% Recruit Holdings Co., Ltd. 2.6% Nestlé SA, Registered Shares 2.2% Publicis Groupe SA 2.2% Equity Sector Allocation Geographic Allocation
Largest Holdings [Text Block]	Top Holdings Novo Nordisk A/S 4.0% Schneider Electric SE 3.1% ASML Holding NV 3.0% Renesas Electronics Corp. 2.8% 3i Group PLC 2.7% Adidas AG 2.6% Capcom Co., Ltd. 2.6% Recruit Holdings Co., Ltd. 2.6% Nestlé SA, Registered Shares 2.2% Publicis Groupe SA 2.2%
Columbia Acorn International SelectSM Institutional 3 Class
Shareholder Report [Line Items]
Fund Name	Columbia Acorn International SelectSM
Class Name	Institutional 3 Class
Trading Symbol	CSIRX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report SM
Shareholder Report Annual or Semi-Annual	Semi - Annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature. You can also request more information by contacting us at 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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional 3 Class $ 0.79 %
Expenses Paid, Amount	$ 40
Expense Ratio, Percent	0.79%
Net Assets	$ 214,450,418
Holdings Count | Holding	68
Investment Company, Portfolio Turnover	62%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings $ Portfolio turnover for the reporting period $
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 Novo Nordisk A/S 4.0% Schneider Electric SE 3.1% ASML Holding NV 3.0% Renesas Electronics Corp. 2.8% 3i Group PLC 2.7% Adidas AG 2.6% Capcom Co., Ltd. 2.6% Recruit Holdings Co., Ltd. 2.6% Nestlé SA, Registered Shares 2.2% Publicis Groupe SA 2.2% Equity Sector Allocation Geographic Allocation
Largest Holdings [Text Block]	Top Holdings Novo Nordisk A/S 4.0% Schneider Electric SE 3.1% ASML Holding NV 3.0% Renesas Electronics Corp. 2.8% 3i Group PLC 2.7% Adidas AG 2.6% Capcom Co., Ltd. 2.6% Recruit Holdings Co., Ltd. 2.6% Nestlé SA, Registered Shares 2.2% Publicis Groupe SA 2.2%
Columbia Thermostat FundSM Class A
Shareholder Report [Line Items]
Fund Name	Columbia Thermostat FundSM
Class Name	Class A
Trading Symbol	CTFAX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report SM
Shareholder Report Annual or Semi-Annual	Semi - Annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature. You can also request more information by contacting us at 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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $ 0.50 %
Expenses Paid, Amount	$ 25
Expense Ratio, Percent	0.50%
Net Assets	$ 1,250,944,133
Holdings Count | Holding	13
Investment Company, Portfolio Turnover	62%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings $ Portfolio turnover for the reporting period $
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 Columbia Total Return Bond Fund, Institutional 3 Class 15.0 % Columbia Corporate Income Fund, Institutional 3 Class 12.0 % Columbia U.S. Treasury Index Fund, Institutional 3 Class 12.0 % Columbia Large Cap Enhanced Core Fund, Institutional 3 Class 10.1 % Columbia Contrarian Core Fund, Institutional 3 Class 10.0 % Columbia Quality Income Fund, Institutional 3 Class 8.9 % Columbia Large Cap Index Fund, Institutional 3 Class 8.0 % Columbia High Yield Bond Fund, Institutional 3 Class 6.0 % Columbia Diversified Fixed Income Allocation ETF 6.0 % Columbia Research Enhanced Core ETF 4.0 % Asset Categories
Largest Holdings [Text Block]	Top Holdings Columbia Total Return Bond Fund, Institutional 3 Class 15.0 % Columbia Corporate Income Fund, Institutional 3 Class 12.0 % Columbia U.S. Treasury Index Fund, Institutional 3 Class 12.0 % Columbia Large Cap Enhanced Core Fund, Institutional 3 Class 10.1 % Columbia Contrarian Core Fund, Institutional 3 Class 10.0 % Columbia Quality Income Fund, Institutional 3 Class 8.9 % Columbia Large Cap Index Fund, Institutional 3 Class 8.0 % Columbia High Yield Bond Fund, Institutional 3 Class 6.0 % Columbia Diversified Fixed Income Allocation ETF 6.0 % Columbia Research Enhanced Core ETF 4.0 %
Columbia Thermostat FundSM Advisor Class
Shareholder Report [Line Items]
Fund Name	Columbia Thermostat FundSM
Class Name	Advisor Class
Trading Symbol	CTORX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report SM
Shareholder Report Annual or Semi-Annual	semi-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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Advisor Class $ 0.25 %
Expenses Paid, Amount	$ 13
Expense Ratio, Percent	0.25%
Net Assets	$ 1,250,944,133
Holdings Count | Holding	13
Investment Company, Portfolio Turnover	62%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings $ Portfolio turnover for the reporting period $
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 Columbia Total Return Bond Fund, Institutional 3 Class 15.0 % Columbia Corporate Income Fund, Institutional 3 Class 12.0 % Columbia U.S. Treasury Index Fund, Institutional 3 Class 12.0 % Columbia Large Cap Enhanced Core Fund, Institutional 3 Class 10.1 % Columbia Contrarian Core Fund, Institutional 3 Class 10.0 % Columbia Quality Income Fund, Institutional 3 Class 8.9 % Columbia Large Cap Index Fund, Institutional 3 Class 8.0 % Columbia High Yield Bond Fund, Institutional 3 Class 6.0 % Columbia Diversified Fixed Income Allocation ETF 6.0 % Columbia Research Enhanced Core ETF 4.0 % Asset Categories
Largest Holdings [Text Block]	Top Holdings Columbia Total Return Bond Fund, Institutional 3 Class 15.0 % Columbia Corporate Income Fund, Institutional 3 Class 12.0 % Columbia U.S. Treasury Index Fund, Institutional 3 Class 12.0 % Columbia Large Cap Enhanced Core Fund, Institutional 3 Class 10.1 % Columbia Contrarian Core Fund, Institutional 3 Class 10.0 % Columbia Quality Income Fund, Institutional 3 Class 8.9 % Columbia Large Cap Index Fund, Institutional 3 Class 8.0 % Columbia High Yield Bond Fund, Institutional 3 Class 6.0 % Columbia Diversified Fixed Income Allocation ETF 6.0 % Columbia Research Enhanced Core ETF 4.0 %
Columbia Thermostat FundSM Class C
Shareholder Report [Line Items]
Fund Name	Columbia Thermostat FundSM
Class Name	Class C
Trading Symbol	CTFDX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report SM
Shareholder Report Annual or Semi-Annual	semi-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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $ 1.25 %
Expenses Paid, Amount	$ 63
Expense Ratio, Percent	1.25%
Net Assets	$ 1,250,944,133
Holdings Count | Holding	13
Investment Company, Portfolio Turnover	62%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings $ Portfolio turnover for the reporting period $
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 Columbia Total Return Bond Fund, Institutional 3 Class 15.0 % Columbia Corporate Income Fund, Institutional 3 Class 12.0 % Columbia U.S. Treasury Index Fund, Institutional 3 Class 12.0 % Columbia Large Cap Enhanced Core Fund, Institutional 3 Class 10.1 % Columbia Contrarian Core Fund, Institutional 3 Class 10.0 % Columbia Quality Income Fund, Institutional 3 Class 8.9 % Columbia Large Cap Index Fund, Institutional 3 Class 8.0 % Columbia High Yield Bond Fund, Institutional 3 Class 6.0 % Columbia Diversified Fixed Income Allocation ETF 6.0 % Columbia Research Enhanced Core ETF 4.0 % Asset Categories
Largest Holdings [Text Block]	Top Holdings Columbia Total Return Bond Fund, Institutional 3 Class 15.0 % Columbia Corporate Income Fund, Institutional 3 Class 12.0 % Columbia U.S. Treasury Index Fund, Institutional 3 Class 12.0 % Columbia Large Cap Enhanced Core Fund, Institutional 3 Class 10.1 % Columbia Contrarian Core Fund, Institutional 3 Class 10.0 % Columbia Quality Income Fund, Institutional 3 Class 8.9 % Columbia Large Cap Index Fund, Institutional 3 Class 8.0 % Columbia High Yield Bond Fund, Institutional 3 Class 6.0 % Columbia Diversified Fixed Income Allocation ETF 6.0 % Columbia Research Enhanced Core ETF 4.0 %
Columbia Thermostat FundSM Institutional Class
Shareholder Report [Line Items]
Fund Name	Columbia Thermostat FundSM
Class Name	Institutional Class
Trading Symbol	COTZX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report SM
Shareholder Report Annual or Semi-Annual	semi-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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $ 0.25 %
Expenses Paid, Amount	$ 13
Expense Ratio, Percent	0.25%
Net Assets	$ 1,250,944,133
Holdings Count | Holding	13
Investment Company, Portfolio Turnover	62%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings $ Portfolio turnover for the reporting period $
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 Columbia Total Return Bond Fund, Institutional 3 Class 15.0 % Columbia Corporate Income Fund, Institutional 3 Class 12.0 % Columbia U.S. Treasury Index Fund, Institutional 3 Class 12.0 % Columbia Large Cap Enhanced Core Fund, Institutional 3 Class 10.1 % Columbia Contrarian Core Fund, Institutional 3 Class 10.0 % Columbia Quality Income Fund, Institutional 3 Class 8.9 % Columbia Large Cap Index Fund, Institutional 3 Class 8.0 % Columbia High Yield Bond Fund, Institutional 3 Class 6.0 % Columbia Diversified Fixed Income Allocation ETF 6.0 % Columbia Research Enhanced Core ETF 4.0 % Asset Categories
Largest Holdings [Text Block]	Top Holdings Columbia Total Return Bond Fund, Institutional 3 Class 15.0 % Columbia Corporate Income Fund, Institutional 3 Class 12.0 % Columbia U.S. Treasury Index Fund, Institutional 3 Class 12.0 % Columbia Large Cap Enhanced Core Fund, Institutional 3 Class 10.1 % Columbia Contrarian Core Fund, Institutional 3 Class 10.0 % Columbia Quality Income Fund, Institutional 3 Class 8.9 % Columbia Large Cap Index Fund, Institutional 3 Class 8.0 % Columbia High Yield Bond Fund, Institutional 3 Class 6.0 % Columbia Diversified Fixed Income Allocation ETF 6.0 % Columbia Research Enhanced Core ETF 4.0 %
Columbia Thermostat FundSM Institutional 2 Class
Shareholder Report [Line Items]
Fund Name	Columbia Thermostat FundSM
Class Name	Institutional 2 Class
Trading Symbol	CQTRX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report SM
Shareholder Report Annual or Semi-Annual	semi-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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional 2 Class $ 0.20 %
Expenses Paid, Amount	$ 10
Expense Ratio, Percent	0.20%
Net Assets	$ 1,250,944,133
Holdings Count | Holding	13
Investment Company, Portfolio Turnover	62%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings $ Portfolio turnover for the reporting period $
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 Columbia Total Return Bond Fund, Institutional 3 Class 15.0 % Columbia Corporate Income Fund, Institutional 3 Class 12.0 % Columbia U.S. Treasury Index Fund, Institutional 3 Class 12.0 % Columbia Large Cap Enhanced Core Fund, Institutional 3 Class 10.1 % Columbia Contrarian Core Fund, Institutional 3 Class 10.0 % Columbia Quality Income Fund, Institutional 3 Class 8.9 % Columbia Large Cap Index Fund, Institutional 3 Class 8.0 % Columbia High Yield Bond Fund, Institutional 3 Class 6.0 % Columbia Diversified Fixed Income Allocation ETF 6.0 % Columbia Research Enhanced Core ETF 4.0 % Asset Categories
Largest Holdings [Text Block]	Top Holdings Columbia Total Return Bond Fund, Institutional 3 Class 15.0 % Columbia Corporate Income Fund, Institutional 3 Class 12.0 % Columbia U.S. Treasury Index Fund, Institutional 3 Class 12.0 % Columbia Large Cap Enhanced Core Fund, Institutional 3 Class 10.1 % Columbia Contrarian Core Fund, Institutional 3 Class 10.0 % Columbia Quality Income Fund, Institutional 3 Class 8.9 % Columbia Large Cap Index Fund, Institutional 3 Class 8.0 % Columbia High Yield Bond Fund, Institutional 3 Class 6.0 % Columbia Diversified Fixed Income Allocation ETF 6.0 % Columbia Research Enhanced Core ETF 4.0 %
Columbia Thermostat FundSM Institutional 3 Class
Shareholder Report [Line Items]
Fund Name	Columbia Thermostat FundSM
Class Name	Institutional 3 Class
Trading Symbol	CYYYX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report SM
Shareholder Report Annual or Semi-Annual	semi-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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional 3 Class $ 0.16 %
Expenses Paid, Amount	$ 8
Expense Ratio, Percent	0.16%
Net Assets	$ 1,250,944,133
Holdings Count | Holding	13
Investment Company, Portfolio Turnover	62%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $1,250,944,133 Total number holdings 13 Portfolio turnover for the reporting period 62%
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 Top Holdings Columbia Total Return Bond Fund, Institutional 3 Class 15.0 % Columbia Corporate Income Fund, Institutional 3 Class 12.0 % Columbia U.S. Treasury Index Fund, Institutional 3 Class 12.0 % Columbia Large Cap Enhanced Core Fund, Institutional 3 Class 10.1 % Columbia Contrarian Core Fund, Institutional 3 Class 10.0 % Columbia Quality Income Fund, Institutional 3 Class 8.9 % Columbia Large Cap Index Fund, Institutional 3 Class 8.0 % Columbia High Yield Bond Fund, Institutional 3 Class 6.0 % Columbia Diversified Fixed Income Allocation ETF 6.0 % Columbia Research Enhanced Core ETF 4.0 % Asset Categories
Largest Holdings [Text Block]	Top Holdings Columbia Total Return Bond Fund, Institutional 3 Class 15.0 % Columbia Corporate Income Fund, Institutional 3 Class 12.0 % Columbia U.S. Treasury Index Fund, Institutional 3 Class 12.0 % Columbia Large Cap Enhanced Core Fund, Institutional 3 Class 10.1 % Columbia Contrarian Core Fund, Institutional 3 Class 10.0 % Columbia Quality Income Fund, Institutional 3 Class 8.9 % Columbia Large Cap Index Fund, Institutional 3 Class 8.0 % Columbia High Yield Bond Fund, Institutional 3 Class 6.0 % Columbia Diversified Fixed Income Allocation ETF 6.0 % Columbia Research Enhanced Core ETF 4.0 %
Columbia Acorn European FundSM Class A
Shareholder Report [Line Items]
Fund Name	Columbia Acorn European FundSM
Class Name	Class A
Trading Symbol	CAEAX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report SM
Shareholder Report Annual or Semi-Annual	semi-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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $ 1.45 %
Expenses Paid, Amount	$ 72
Expense Ratio, Percent	1.45%
Net Assets	$ 49,473,773
Holdings Count | Holding	52
Investment Company, Portfolio Turnover	20%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $49,473,773 Total number of portfolio holdings 52 Portfolio turnover for the reporting period 20%
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 AddTech AB, B Shares 4.2% Diploma PLC 4.2% Amplifon SpA 4.1% Intermediate Capital Group PLC 4.0% Auto Trader Group PLC 4.0% Rightmove PLC 4.0% Belimo Holding AG, Registered Shares 3.9% Munters Group AB 3.6% Carel Industries SpA 3.3% Hexagon AB, Class B 3.2% Equity Sector Allocation Geographic Allocation
Largest Holdings [Text Block]	Top Holdings AddTech AB, B Shares 4.2% Diploma PLC 4.2% Amplifon SpA 4.1% Intermediate Capital Group PLC 4.0% Auto Trader Group PLC 4.0% Rightmove PLC 4.0% Belimo Holding AG, Registered Shares 3.9% Munters Group AB 3.6% Carel Industries SpA 3.3% Hexagon AB, Class B 3.2%
Columbia Acorn European FundSM Advisor Class
Shareholder Report [Line Items]
Fund Name	Columbia Acorn European FundSM
Class Name	Advisor Class
Trading Symbol	CLOFX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report SM
Shareholder Report Annual or Semi-Annual	semi-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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Advisor Class $ 1.20 %
Expenses Paid, Amount	$ 59
Expense Ratio, Percent	1.20%
Net Assets	$ 49,473,773
Holdings Count | Holding	52
Investment Company, Portfolio Turnover	20%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $49,473,773 Total number of portfolio holdings 52 Portfolio turnover for the reporting period 20%
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 AddTech AB, B Shares 4.2% Diploma PLC 4.2% Amplifon SpA 4.1% Intermediate Capital Group PLC 4.0% Auto Trader Group PLC 4.0% Rightmove PLC 4.0% Belimo Holding AG, Registered Shares 3.9% Munters Group AB 3.6% Carel Industries SpA 3.3% Hexagon AB, Class B 3.2% Equity Sector Allocation Geographic Allocation
Largest Holdings [Text Block]	Top Holdings AddTech AB, B Shares 4.2% Diploma PLC 4.2% Amplifon SpA 4.1% Intermediate Capital Group PLC 4.0% Auto Trader Group PLC 4.0% Rightmove PLC 4.0% Belimo Holding AG, Registered Shares 3.9% Munters Group AB 3.6% Carel Industries SpA 3.3% Hexagon AB, Class B 3.2%
Columbia Acorn European FundSM Institutional Class
Shareholder Report [Line Items]
Fund Name	Columbia Acorn European FundSM
Class Name	Institutional Class
Trading Symbol	CAEZX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report SM
Shareholder Report Annual or Semi-Annual	semi-annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at 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 Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Class $ 1.20 %
Expenses Paid, Amount	$ 59
Expense Ratio, Percent	1.20%
Net Assets	$ 49,473,773
Holdings Count | Holding	52
Investment Company, Portfolio Turnover	20%
Additional Fund Statistics [Text Block]	Fund net assets $ Total number of portfolio holdings 52 Portfolio turnover for the reporting period 20%
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 AddTech AB, B Shares 4.2% Diploma PLC 4.2% Amplifon SpA 4.1% Intermediate Capital Group PLC 4.0% Auto Trader Group PLC 4.0% Rightmove PLC 4.0% Belimo Holding AG, Registered Shares 3.9% Munters Group AB 3.6% Carel Industries SpA 3.3% Hexagon AB, Class B 3.2% Equity Sector Allocation Geographic Allocation
Largest Holdings [Text Block]	Top Holdings AddTech AB, B Shares 4.2% Diploma PLC 4.2% Amplifon SpA 4.1% Intermediate Capital Group PLC 4.0% Auto Trader Group PLC 4.0% Rightmove PLC 4.0% Belimo Holding AG, Registered Shares 3.9% Munters Group AB 3.6% Carel Industries SpA 3.3% Hexagon AB, Class B 3.2%

Shareholder Report, Holdings (D

Shareholder Report, Holdings (Details)	Jun. 30, 2024
Columbia Acorn European FundSM Institutional Class | AddTech AB, B Shares [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.20%
Columbia Acorn European FundSM Institutional Class | Diploma PLC [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.20%
Columbia Acorn European FundSM Institutional Class | Amplifon SpA [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Columbia Acorn European FundSM Institutional Class | Intermediate Capital Group PLC [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn European FundSM Institutional Class | Auto Trader Group PLC [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn European FundSM Institutional Class | Rightmove PLC [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn European FundSM Institutional Class | Belimo Holding AG, Registered Shares [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.90%
Columbia Acorn European FundSM Institutional Class | Munters Group AB [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%
Columbia Acorn European FundSM Institutional Class | Carel Industries SpA [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.30%
Columbia Acorn European FundSM Institutional Class | Hexagon AB, Class B [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%
Columbia Acorn European FundSM Institutional Class | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	38.70%
Columbia Acorn European FundSM Institutional Class | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.20%
Columbia Acorn European FundSM Institutional Class | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.40%
Columbia Acorn European FundSM Institutional Class | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.70%
Columbia Acorn European FundSM Institutional Class | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.30%
Columbia Acorn European FundSM Institutional Class | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.10%
Columbia Acorn European FundSM Institutional Class | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Acorn European FundSM Institutional Class | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Acorn European FundSM Institutional Class | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Acorn European FundSM Institutional Class | UNITED KINGDOM
Holdings [Line Items]
Percent of Net Asset Value	32.90%
Columbia Acorn European FundSM Institutional Class | SWEDEN
Holdings [Line Items]
Percent of Net Asset Value	13.10%
Columbia Acorn European FundSM Institutional Class | SWITZERLAND
Holdings [Line Items]
Percent of Net Asset Value	12.80%
Columbia Acorn European FundSM Institutional Class | GERMANY
Holdings [Line Items]
Percent of Net Asset Value	9.50%
Columbia Acorn European FundSM Institutional Class | ITALY
Holdings [Line Items]
Percent of Net Asset Value	7.40%
Columbia Acorn European FundSM Institutional Class | NETHERLANDS
Holdings [Line Items]
Percent of Net Asset Value	6.20%
Columbia Acorn European FundSM Institutional Class | FRANCE
Holdings [Line Items]
Percent of Net Asset Value	4.40%
Columbia Acorn European FundSM Institutional Class | UNITED STATES
Holdings [Line Items]
Percent of Net Asset Value	3.80%
Columbia Acorn European FundSM Institutional Class | Non-US [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Acorn European FundSM Institutional Class | FINLAND
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Acorn European FundSM Institutional Class | SPAIN
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn European FundSM Advisor Class | AddTech AB, B Shares [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.20%
Columbia Acorn European FundSM Advisor Class | Diploma PLC [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.20%
Columbia Acorn European FundSM Advisor Class | Amplifon SpA [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Columbia Acorn European FundSM Advisor Class | Intermediate Capital Group PLC [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn European FundSM Advisor Class | Auto Trader Group PLC [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn European FundSM Advisor Class | Rightmove PLC [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn European FundSM Advisor Class | Belimo Holding AG, Registered Shares [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.90%
Columbia Acorn European FundSM Advisor Class | Munters Group AB [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%
Columbia Acorn European FundSM Advisor Class | Carel Industries SpA [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.30%
Columbia Acorn European FundSM Advisor Class | Hexagon AB, Class B [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%
Columbia Acorn European FundSM Advisor Class | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	38.70%
Columbia Acorn European FundSM Advisor Class | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.20%
Columbia Acorn European FundSM Advisor Class | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.40%
Columbia Acorn European FundSM Advisor Class | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.70%
Columbia Acorn European FundSM Advisor Class | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.30%
Columbia Acorn European FundSM Advisor Class | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.10%
Columbia Acorn European FundSM Advisor Class | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Acorn European FundSM Advisor Class | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Acorn European FundSM Advisor Class | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Acorn European FundSM Advisor Class | UNITED KINGDOM
Holdings [Line Items]
Percent of Net Asset Value	32.90%
Columbia Acorn European FundSM Advisor Class | SWEDEN
Holdings [Line Items]
Percent of Net Asset Value	13.10%
Columbia Acorn European FundSM Advisor Class | SWITZERLAND
Holdings [Line Items]
Percent of Net Asset Value	12.80%
Columbia Acorn European FundSM Advisor Class | GERMANY
Holdings [Line Items]
Percent of Net Asset Value	9.50%
Columbia Acorn European FundSM Advisor Class | ITALY
Holdings [Line Items]
Percent of Net Asset Value	7.40%
Columbia Acorn European FundSM Advisor Class | NETHERLANDS
Holdings [Line Items]
Percent of Net Asset Value	6.20%
Columbia Acorn European FundSM Advisor Class | FRANCE
Holdings [Line Items]
Percent of Net Asset Value	4.40%
Columbia Acorn European FundSM Advisor Class | UNITED STATES
Holdings [Line Items]
Percent of Net Asset Value	3.80%
Columbia Acorn European FundSM Advisor Class | FINLAND
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Acorn European FundSM Advisor Class | SPAIN
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn European FundSM Advisor Class | Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Acorn European FundSM Class A | AddTech AB, B Shares [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.20%
Columbia Acorn European FundSM Class A | Diploma PLC [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.20%
Columbia Acorn European FundSM Class A | Amplifon SpA [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Columbia Acorn European FundSM Class A | Intermediate Capital Group PLC [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn European FundSM Class A | Auto Trader Group PLC [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn European FundSM Class A | Rightmove PLC [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn European FundSM Class A | Belimo Holding AG, Registered Shares [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.90%
Columbia Acorn European FundSM Class A | Munters Group AB [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%
Columbia Acorn European FundSM Class A | Carel Industries SpA [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.30%
Columbia Acorn European FundSM Class A | Hexagon AB, Class B [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%
Columbia Acorn European FundSM Class A | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	38.70%
Columbia Acorn European FundSM Class A | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.20%
Columbia Acorn European FundSM Class A | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.40%
Columbia Acorn European FundSM Class A | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.70%
Columbia Acorn European FundSM Class A | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.30%
Columbia Acorn European FundSM Class A | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.10%
Columbia Acorn European FundSM Class A | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Acorn European FundSM Class A | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Acorn European FundSM Class A | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Acorn European FundSM Class A | UNITED KINGDOM
Holdings [Line Items]
Percent of Net Asset Value	32.90%
Columbia Acorn European FundSM Class A | SWEDEN
Holdings [Line Items]
Percent of Net Asset Value	13.10%
Columbia Acorn European FundSM Class A | SWITZERLAND
Holdings [Line Items]
Percent of Net Asset Value	12.80%
Columbia Acorn European FundSM Class A | GERMANY
Holdings [Line Items]
Percent of Net Asset Value	9.50%
Columbia Acorn European FundSM Class A | ITALY
Holdings [Line Items]
Percent of Net Asset Value	7.40%
Columbia Acorn European FundSM Class A | NETHERLANDS
Holdings [Line Items]
Percent of Net Asset Value	6.20%
Columbia Acorn European FundSM Class A | FRANCE
Holdings [Line Items]
Percent of Net Asset Value	4.40%
Columbia Acorn European FundSM Class A | UNITED STATES
Holdings [Line Items]
Percent of Net Asset Value	3.80%
Columbia Acorn European FundSM Class A | FINLAND
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Acorn European FundSM Class A | SPAIN
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn European FundSM Class A | Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Thermostat FundSM Institutional 3 Class | Columbia Total Return Bond Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	15%
Columbia Thermostat FundSM Institutional 3 Class | Columbia Corporate Income Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
Columbia Thermostat FundSM Institutional 3 Class | Columbia U.S. Treasury Index Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
Columbia Thermostat FundSM Institutional 3 Class | Columbia Large Cap Enhanced Core Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.10%
Columbia Thermostat FundSM Institutional 3 Class | Columbia Contrarian Core Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	10%
Columbia Thermostat FundSM Institutional 3 Class | Columbia Quality Income Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.90%
Columbia Thermostat FundSM Institutional 3 Class | Columbia Large Cap Index Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	8%
Columbia Thermostat FundSM Institutional 3 Class | Columbia High Yield Bond Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	6%
Columbia Thermostat FundSM Institutional 3 Class | Columbia Diversified Fixed Income Allocation ETF [Member]
Holdings [Line Items]
Percent of Net Asset Value	6%
Columbia Thermostat FundSM Institutional 3 Class | Columbia Research Enhanced Core ETF [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Thermostat FundSM Institutional 3 Class | Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.10%
Columbia Thermostat FundSM Institutional 3 Class | Fixed Income Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	53.90%
Columbia Thermostat FundSM Institutional 3 Class | Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	36.10%
Columbia Thermostat FundSM Institutional 3 Class | Exchange Traded Fixed Income Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	6%
Columbia Thermostat FundSM Institutional 3 Class | ExchangeTraded Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Thermostat FundSM Institutional 2 Class | Columbia Total Return Bond Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	15%
Columbia Thermostat FundSM Institutional 2 Class | Columbia Corporate Income Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
Columbia Thermostat FundSM Institutional 2 Class | Columbia U.S. Treasury Index Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
Columbia Thermostat FundSM Institutional 2 Class | Columbia Large Cap Enhanced Core Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.10%
Columbia Thermostat FundSM Institutional 2 Class | Columbia Contrarian Core Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	10%
Columbia Thermostat FundSM Institutional 2 Class | Columbia Quality Income Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.90%
Columbia Thermostat FundSM Institutional 2 Class | Columbia Large Cap Index Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	8%
Columbia Thermostat FundSM Institutional 2 Class | Columbia High Yield Bond Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	6%
Columbia Thermostat FundSM Institutional 2 Class | Columbia Diversified Fixed Income Allocation ETF [Member]
Holdings [Line Items]
Percent of Net Asset Value	6%
Columbia Thermostat FundSM Institutional 2 Class | Columbia Research Enhanced Core ETF [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Thermostat FundSM Institutional 2 Class | Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.10%
Columbia Thermostat FundSM Institutional 2 Class | Fixed Income Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	53.90%
Columbia Thermostat FundSM Institutional 2 Class | Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	36.10%
Columbia Thermostat FundSM Institutional 2 Class | Exchange Traded Fixed Income Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	6%
Columbia Thermostat FundSM Institutional 2 Class | ExchangeTraded Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Thermostat FundSM Institutional Class | Columbia Total Return Bond Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	15%
Columbia Thermostat FundSM Institutional Class | Columbia Corporate Income Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
Columbia Thermostat FundSM Institutional Class | Columbia U.S. Treasury Index Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
Columbia Thermostat FundSM Institutional Class | Columbia Large Cap Enhanced Core Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.10%
Columbia Thermostat FundSM Institutional Class | Columbia Contrarian Core Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	10%
Columbia Thermostat FundSM Institutional Class | Columbia Quality Income Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.90%
Columbia Thermostat FundSM Institutional Class | Columbia Large Cap Index Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	8%
Columbia Thermostat FundSM Institutional Class | Columbia High Yield Bond Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	6%
Columbia Thermostat FundSM Institutional Class | Columbia Diversified Fixed Income Allocation ETF [Member]
Holdings [Line Items]
Percent of Net Asset Value	6%
Columbia Thermostat FundSM Institutional Class | Columbia Research Enhanced Core ETF [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Thermostat FundSM Institutional Class | Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.10%
Columbia Thermostat FundSM Institutional Class | Fixed Income Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	53.90%
Columbia Thermostat FundSM Institutional Class | Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	36.10%
Columbia Thermostat FundSM Institutional Class | Exchange Traded Fixed Income Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	6%
Columbia Thermostat FundSM Institutional Class | ExchangeTraded Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Thermostat FundSM Class C | Columbia Total Return Bond Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	15%
Columbia Thermostat FundSM Class C | Columbia Corporate Income Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
Columbia Thermostat FundSM Class C | Columbia U.S. Treasury Index Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
Columbia Thermostat FundSM Class C | Columbia Large Cap Enhanced Core Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.10%
Columbia Thermostat FundSM Class C | Columbia Contrarian Core Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	10%
Columbia Thermostat FundSM Class C | Columbia Quality Income Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.90%
Columbia Thermostat FundSM Class C | Columbia Large Cap Index Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	8%
Columbia Thermostat FundSM Class C | Columbia High Yield Bond Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	6%
Columbia Thermostat FundSM Class C | Columbia Diversified Fixed Income Allocation ETF [Member]
Holdings [Line Items]
Percent of Net Asset Value	6%
Columbia Thermostat FundSM Class C | Columbia Research Enhanced Core ETF [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Thermostat FundSM Class C | Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.10%
Columbia Thermostat FundSM Class C | Fixed Income Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	53.90%
Columbia Thermostat FundSM Class C | Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	36.10%
Columbia Thermostat FundSM Class C | Exchange Traded Fixed Income Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	6%
Columbia Thermostat FundSM Class C | ExchangeTraded Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Thermostat FundSM Advisor Class | Columbia Total Return Bond Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	15%
Columbia Thermostat FundSM Advisor Class | Columbia Corporate Income Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
Columbia Thermostat FundSM Advisor Class | Columbia U.S. Treasury Index Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
Columbia Thermostat FundSM Advisor Class | Columbia Large Cap Enhanced Core Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.10%
Columbia Thermostat FundSM Advisor Class | Columbia Contrarian Core Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	10%
Columbia Thermostat FundSM Advisor Class | Columbia Quality Income Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.90%
Columbia Thermostat FundSM Advisor Class | Columbia Large Cap Index Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	8%
Columbia Thermostat FundSM Advisor Class | Columbia High Yield Bond Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	6%
Columbia Thermostat FundSM Advisor Class | Columbia Diversified Fixed Income Allocation ETF [Member]
Holdings [Line Items]
Percent of Net Asset Value	6%
Columbia Thermostat FundSM Advisor Class | Columbia Research Enhanced Core ETF [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Thermostat FundSM Advisor Class | Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.10%
Columbia Thermostat FundSM Advisor Class | Fixed Income Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	53.90%
Columbia Thermostat FundSM Advisor Class | Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	36.10%
Columbia Thermostat FundSM Advisor Class | Exchange Traded Fixed Income Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	6%
Columbia Thermostat FundSM Advisor Class | ExchangeTraded Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Thermostat FundSM Class A | Columbia Total Return Bond Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	15%
Columbia Thermostat FundSM Class A | Columbia Corporate Income Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
Columbia Thermostat FundSM Class A | Columbia U.S. Treasury Index Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
Columbia Thermostat FundSM Class A | Columbia Large Cap Enhanced Core Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.10%
Columbia Thermostat FundSM Class A | Columbia Contrarian Core Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	10%
Columbia Thermostat FundSM Class A | Columbia Quality Income Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.90%
Columbia Thermostat FundSM Class A | Columbia Large Cap Index Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	8%
Columbia Thermostat FundSM Class A | Columbia High Yield Bond Fund, Institutional 3 Class [Member]
Holdings [Line Items]
Percent of Net Asset Value	6%
Columbia Thermostat FundSM Class A | Columbia Diversified Fixed Income Allocation ETF [Member]
Holdings [Line Items]
Percent of Net Asset Value	6%
Columbia Thermostat FundSM Class A | Columbia Research Enhanced Core ETF [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Thermostat FundSM Class A | Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.10%
Columbia Thermostat FundSM Class A | Fixed Income Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	53.90%
Columbia Thermostat FundSM Class A | Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	36.10%
Columbia Thermostat FundSM Class A | Exchange Traded Fixed Income Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	6%
Columbia Thermostat FundSM Class A | ExchangeTraded Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn International SelectSM Institutional 3 Class | Novo Nordisk A/S [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn International SelectSM Institutional 3 Class | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.10%
Columbia Acorn International SelectSM Institutional 3 Class | ASML Holding NV [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Acorn International SelectSM Institutional 3 Class | Renesas Electronics Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Acorn International SelectSM Institutional 3 Class | 3i Group PLC
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Acorn International SelectSM Institutional 3 Class | Adidas AG [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Acorn International SelectSM Institutional 3 Class | Capcom Co., Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Acorn International SelectSM Institutional 3 Class | Recruit Holdings Co., Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Acorn International SelectSM Institutional 3 Class | Nestlé SA, Registered Shares [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Acorn International SelectSM Institutional 3 Class | Publicis Groupe SA [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Acorn International SelectSM Institutional 3 Class | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.90%
Columbia Acorn International SelectSM Institutional 3 Class | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.90%
Columbia Acorn International SelectSM Institutional 3 Class | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.60%
Columbia Acorn International SelectSM Institutional 3 Class | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.80%
Columbia Acorn International SelectSM Institutional 3 Class | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.10%
Columbia Acorn International SelectSM Institutional 3 Class | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Columbia Acorn International SelectSM Institutional 3 Class | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.90%
Columbia Acorn International SelectSM Institutional 3 Class | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Columbia Acorn International SelectSM Institutional 3 Class | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Columbia Acorn International SelectSM Institutional 3 Class | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Columbia Acorn International SelectSM Institutional 3 Class | UNITED KINGDOM
Holdings [Line Items]
Percent of Net Asset Value	16.40%
Columbia Acorn International SelectSM Institutional 3 Class | SWITZERLAND
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Acorn International SelectSM Institutional 3 Class | GERMANY
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Columbia Acorn International SelectSM Institutional 3 Class | NETHERLANDS
Holdings [Line Items]
Percent of Net Asset Value	3.90%
Columbia Acorn International SelectSM Institutional 3 Class | FRANCE
Holdings [Line Items]
Percent of Net Asset Value	14.60%
Columbia Acorn International SelectSM Institutional 3 Class | UNITED STATES
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Columbia Acorn International SelectSM Institutional 3 Class | Non-US [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.80%
Columbia Acorn International SelectSM Institutional 3 Class | JAPAN
Holdings [Line Items]
Percent of Net Asset Value	26.90%
Columbia Acorn International SelectSM Institutional 3 Class | CANADA
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Columbia Acorn International SelectSM Institutional 3 Class | DENMARK
Holdings [Line Items]
Percent of Net Asset Value	3.90%
Columbia Acorn International SelectSM Institutional 3 Class | INDIA
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Acorn International SelectSM Institutional 2 Class | Novo Nordisk A/S [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn International SelectSM Institutional 2 Class | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.10%
Columbia Acorn International SelectSM Institutional 2 Class | ASML Holding NV [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Acorn International SelectSM Institutional 2 Class | Renesas Electronics Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Acorn International SelectSM Institutional 2 Class | 3i Group PLC
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Acorn International SelectSM Institutional 2 Class | Adidas AG [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Acorn International SelectSM Institutional 2 Class | Capcom Co., Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Acorn International SelectSM Institutional 2 Class | Recruit Holdings Co., Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Acorn International SelectSM Institutional 2 Class | Nestlé SA, Registered Shares [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Acorn International SelectSM Institutional 2 Class | Publicis Groupe SA [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Acorn International SelectSM Institutional 2 Class | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.90%
Columbia Acorn International SelectSM Institutional 2 Class | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.90%
Columbia Acorn International SelectSM Institutional 2 Class | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.60%
Columbia Acorn International SelectSM Institutional 2 Class | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.80%
Columbia Acorn International SelectSM Institutional 2 Class | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.10%
Columbia Acorn International SelectSM Institutional 2 Class | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Columbia Acorn International SelectSM Institutional 2 Class | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.90%
Columbia Acorn International SelectSM Institutional 2 Class | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Columbia Acorn International SelectSM Institutional 2 Class | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Columbia Acorn International SelectSM Institutional 2 Class | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Columbia Acorn International SelectSM Institutional 2 Class | UNITED KINGDOM
Holdings [Line Items]
Percent of Net Asset Value	16.40%
Columbia Acorn International SelectSM Institutional 2 Class | SWITZERLAND
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Acorn International SelectSM Institutional 2 Class | GERMANY
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Columbia Acorn International SelectSM Institutional 2 Class | NETHERLANDS
Holdings [Line Items]
Percent of Net Asset Value	3.90%
Columbia Acorn International SelectSM Institutional 2 Class | FRANCE
Holdings [Line Items]
Percent of Net Asset Value	14.60%
Columbia Acorn International SelectSM Institutional 2 Class | UNITED STATES
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Columbia Acorn International SelectSM Institutional 2 Class | Non-US [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.80%
Columbia Acorn International SelectSM Institutional 2 Class | JAPAN
Holdings [Line Items]
Percent of Net Asset Value	26.90%
Columbia Acorn International SelectSM Institutional 2 Class | CANADA
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Columbia Acorn International SelectSM Institutional 2 Class | DENMARK
Holdings [Line Items]
Percent of Net Asset Value	3.90%
Columbia Acorn International SelectSM Institutional 2 Class | INDIA
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Acorn International SelectSM Institutional Class | Novo Nordisk A/S [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn International SelectSM Institutional Class | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.10%
Columbia Acorn International SelectSM Institutional Class | ASML Holding NV [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Acorn International SelectSM Institutional Class | Renesas Electronics Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Acorn International SelectSM Institutional Class | 3i Group PLC
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Acorn International SelectSM Institutional Class | Adidas AG [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Acorn International SelectSM Institutional Class | Capcom Co., Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Acorn International SelectSM Institutional Class | Recruit Holdings Co., Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Acorn International SelectSM Institutional Class | Nestlé SA, Registered Shares [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Acorn International SelectSM Institutional Class | Publicis Groupe SA [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Acorn International SelectSM Institutional Class | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.90%
Columbia Acorn International SelectSM Institutional Class | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.90%
Columbia Acorn International SelectSM Institutional Class | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.60%
Columbia Acorn International SelectSM Institutional Class | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.80%
Columbia Acorn International SelectSM Institutional Class | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.10%
Columbia Acorn International SelectSM Institutional Class | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Columbia Acorn International SelectSM Institutional Class | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.90%
Columbia Acorn International SelectSM Institutional Class | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Columbia Acorn International SelectSM Institutional Class | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Columbia Acorn International SelectSM Institutional Class | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Columbia Acorn International SelectSM Institutional Class | UNITED KINGDOM
Holdings [Line Items]
Percent of Net Asset Value	16.40%
Columbia Acorn International SelectSM Institutional Class | SWITZERLAND
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Acorn International SelectSM Institutional Class | GERMANY
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Columbia Acorn International SelectSM Institutional Class | NETHERLANDS
Holdings [Line Items]
Percent of Net Asset Value	3.90%
Columbia Acorn International SelectSM Institutional Class | FRANCE
Holdings [Line Items]
Percent of Net Asset Value	14.60%
Columbia Acorn International SelectSM Institutional Class | UNITED STATES
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Columbia Acorn International SelectSM Institutional Class | Non-US [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.80%
Columbia Acorn International SelectSM Institutional Class | JAPAN
Holdings [Line Items]
Percent of Net Asset Value	26.90%
Columbia Acorn International SelectSM Institutional Class | CANADA
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Columbia Acorn International SelectSM Institutional Class | DENMARK
Holdings [Line Items]
Percent of Net Asset Value	3.90%
Columbia Acorn International SelectSM Institutional Class | INDIA
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Acorn International SelectSM Advisor Class | Novo Nordisk A/S [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn International SelectSM Advisor Class | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.10%
Columbia Acorn International SelectSM Advisor Class | ASML Holding NV [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Acorn International SelectSM Advisor Class | Renesas Electronics Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Acorn International SelectSM Advisor Class | 3i Group PLC
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Acorn International SelectSM Advisor Class | Adidas AG [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Acorn International SelectSM Advisor Class | Capcom Co., Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Acorn International SelectSM Advisor Class | Recruit Holdings Co., Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Acorn International SelectSM Advisor Class | Nestlé SA, Registered Shares [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Acorn International SelectSM Advisor Class | Publicis Groupe SA [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Acorn International SelectSM Advisor Class | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.90%
Columbia Acorn International SelectSM Advisor Class | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.90%
Columbia Acorn International SelectSM Advisor Class | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.60%
Columbia Acorn International SelectSM Advisor Class | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.80%
Columbia Acorn International SelectSM Advisor Class | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.10%
Columbia Acorn International SelectSM Advisor Class | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Columbia Acorn International SelectSM Advisor Class | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.90%
Columbia Acorn International SelectSM Advisor Class | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Columbia Acorn International SelectSM Advisor Class | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Columbia Acorn International SelectSM Advisor Class | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Columbia Acorn International SelectSM Advisor Class | UNITED KINGDOM
Holdings [Line Items]
Percent of Net Asset Value	16.40%
Columbia Acorn International SelectSM Advisor Class | SWITZERLAND
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Acorn International SelectSM Advisor Class | GERMANY
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Columbia Acorn International SelectSM Advisor Class | NETHERLANDS
Holdings [Line Items]
Percent of Net Asset Value	3.90%
Columbia Acorn International SelectSM Advisor Class | FRANCE
Holdings [Line Items]
Percent of Net Asset Value	14.60%
Columbia Acorn International SelectSM Advisor Class | UNITED STATES
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Columbia Acorn International SelectSM Advisor Class | Non-US [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.80%
Columbia Acorn International SelectSM Advisor Class | JAPAN
Holdings [Line Items]
Percent of Net Asset Value	26.90%
Columbia Acorn International SelectSM Advisor Class | CANADA
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Columbia Acorn International SelectSM Advisor Class | DENMARK
Holdings [Line Items]
Percent of Net Asset Value	3.90%
Columbia Acorn International SelectSM Advisor Class | INDIA
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Acorn International SelectSM Class A | Novo Nordisk A/S [Member]
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn International SelectSM Class A | Schneider Electric SE [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.10%
Columbia Acorn International SelectSM Class A | ASML Holding NV [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Acorn International SelectSM Class A | Renesas Electronics Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Acorn International SelectSM Class A | 3i Group PLC
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Acorn International SelectSM Class A | Adidas AG [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Acorn International SelectSM Class A | Capcom Co., Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Acorn International SelectSM Class A | Recruit Holdings Co., Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Acorn International SelectSM Class A | Nestlé SA, Registered Shares [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Acorn International SelectSM Class A | Publicis Groupe SA [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Acorn International SelectSM Class A | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.90%
Columbia Acorn International SelectSM Class A | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.90%
Columbia Acorn International SelectSM Class A | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.60%
Columbia Acorn International SelectSM Class A | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.80%
Columbia Acorn International SelectSM Class A | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.10%
Columbia Acorn International SelectSM Class A | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Columbia Acorn International SelectSM Class A | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.90%
Columbia Acorn International SelectSM Class A | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.90%
Columbia Acorn International SelectSM Class A | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Columbia Acorn International SelectSM Class A | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Columbia Acorn International SelectSM Class A | UNITED KINGDOM
Holdings [Line Items]
Percent of Net Asset Value	16.40%
Columbia Acorn International SelectSM Class A | SWITZERLAND
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Acorn International SelectSM Class A | GERMANY
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Columbia Acorn International SelectSM Class A | NETHERLANDS
Holdings [Line Items]
Percent of Net Asset Value	3.90%
Columbia Acorn International SelectSM Class A | FRANCE
Holdings [Line Items]
Percent of Net Asset Value	14.60%
Columbia Acorn International SelectSM Class A | UNITED STATES
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Columbia Acorn International SelectSM Class A | Non-US [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.80%
Columbia Acorn International SelectSM Class A | JAPAN
Holdings [Line Items]
Percent of Net Asset Value	26.90%
Columbia Acorn International SelectSM Class A | CANADA
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Columbia Acorn International SelectSM Class A | DENMARK
Holdings [Line Items]
Percent of Net Asset Value	3.90%
Columbia Acorn International SelectSM Class A | INDIA
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Acorn International® Institutional 3 Class | Intermediate Capital Group PLC [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Acorn International® Institutional 3 Class | Auto Trader Group PLC [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn International® Institutional 3 Class | Belimo Holding AG, Registered Shares [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Columbia Acorn International® Institutional 3 Class | Munters Group AB [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn International® Institutional 3 Class | Hexagon AB, Class B [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Acorn International® Institutional 3 Class | Recruit Holdings Co., Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Acorn International® Institutional 3 Class | Hypoport SE [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn International® Institutional 3 Class | Pro Medicus Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn International® Institutional 3 Class | IMCD NV [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Acorn International® Institutional 3 Class | CCL Industries, Inc., Class B [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Acorn International® Institutional 3 Class | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.70%
Columbia Acorn International® Institutional 3 Class | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.70%
Columbia Acorn International® Institutional 3 Class | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.50%
Columbia Acorn International® Institutional 3 Class | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.10%
Columbia Acorn International® Institutional 3 Class | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Acorn International® Institutional 3 Class | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.10%
Columbia Acorn International® Institutional 3 Class | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Columbia Acorn International® Institutional 3 Class | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.90%
Columbia Acorn International® Institutional 3 Class | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Acorn International® Institutional 3 Class | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Acorn International® Institutional 3 Class | UNITED KINGDOM
Holdings [Line Items]
Percent of Net Asset Value	15.90%
Columbia Acorn International® Institutional 3 Class | SWEDEN
Holdings [Line Items]
Percent of Net Asset Value	5.50%
Columbia Acorn International® Institutional 3 Class | SWITZERLAND
Holdings [Line Items]
Percent of Net Asset Value	6%
Columbia Acorn International® Institutional 3 Class | GERMANY
Holdings [Line Items]
Percent of Net Asset Value	7.40%
Columbia Acorn International® Institutional 3 Class | NETHERLANDS
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn International® Institutional 3 Class | Non-US [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.30%
Columbia Acorn International® Institutional 3 Class | JAPAN
Holdings [Line Items]
Percent of Net Asset Value	18.60%
Columbia Acorn International® Institutional 3 Class | CANADA
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Columbia Acorn International® Institutional 3 Class | AUSTRALIA
Holdings [Line Items]
Percent of Net Asset Value	5.60%
Columbia Acorn International® Institutional 3 Class | TAIWAN
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Columbia Acorn International® Institutional 3 Class | MEXICO
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn International® Institutional 2 Class | Intermediate Capital Group PLC [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Acorn International® Institutional 2 Class | Auto Trader Group PLC [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn International® Institutional 2 Class | Belimo Holding AG, Registered Shares [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Columbia Acorn International® Institutional 2 Class | Munters Group AB [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn International® Institutional 2 Class | Hexagon AB, Class B [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Acorn International® Institutional 2 Class | Recruit Holdings Co., Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Acorn International® Institutional 2 Class | Hypoport SE [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn International® Institutional 2 Class | Pro Medicus Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn International® Institutional 2 Class | IMCD NV [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Acorn International® Institutional 2 Class | CCL Industries, Inc., Class B [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Acorn International® Institutional 2 Class | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.70%
Columbia Acorn International® Institutional 2 Class | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.70%
Columbia Acorn International® Institutional 2 Class | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.50%
Columbia Acorn International® Institutional 2 Class | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.10%
Columbia Acorn International® Institutional 2 Class | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Acorn International® Institutional 2 Class | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.10%
Columbia Acorn International® Institutional 2 Class | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Columbia Acorn International® Institutional 2 Class | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.90%
Columbia Acorn International® Institutional 2 Class | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Acorn International® Institutional 2 Class | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Acorn International® Institutional 2 Class | UNITED KINGDOM
Holdings [Line Items]
Percent of Net Asset Value	15.90%
Columbia Acorn International® Institutional 2 Class | SWEDEN
Holdings [Line Items]
Percent of Net Asset Value	5.50%
Columbia Acorn International® Institutional 2 Class | SWITZERLAND
Holdings [Line Items]
Percent of Net Asset Value	6%
Columbia Acorn International® Institutional 2 Class | GERMANY
Holdings [Line Items]
Percent of Net Asset Value	7.40%
Columbia Acorn International® Institutional 2 Class | NETHERLANDS
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn International® Institutional 2 Class | Non-US [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.30%
Columbia Acorn International® Institutional 2 Class | JAPAN
Holdings [Line Items]
Percent of Net Asset Value	18.60%
Columbia Acorn International® Institutional 2 Class | CANADA
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Columbia Acorn International® Institutional 2 Class | AUSTRALIA
Holdings [Line Items]
Percent of Net Asset Value	5.60%
Columbia Acorn International® Institutional 2 Class | TAIWAN
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Columbia Acorn International® Institutional 2 Class | MEXICO
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn International® Institutional Class | Intermediate Capital Group PLC [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Acorn International® Institutional Class | Auto Trader Group PLC [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn International® Institutional Class | Belimo Holding AG, Registered Shares [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Columbia Acorn International® Institutional Class | Munters Group AB [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn International® Institutional Class | Hexagon AB, Class B [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Acorn International® Institutional Class | Recruit Holdings Co., Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Acorn International® Institutional Class | Hypoport SE [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn International® Institutional Class | Pro Medicus Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn International® Institutional Class | IMCD NV [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Acorn International® Institutional Class | CCL Industries, Inc., Class B [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Acorn International® Institutional Class | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.70%
Columbia Acorn International® Institutional Class | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.70%
Columbia Acorn International® Institutional Class | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.50%
Columbia Acorn International® Institutional Class | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.10%
Columbia Acorn International® Institutional Class | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Acorn International® Institutional Class | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.10%
Columbia Acorn International® Institutional Class | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Columbia Acorn International® Institutional Class | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.90%
Columbia Acorn International® Institutional Class | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Acorn International® Institutional Class | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Acorn International® Institutional Class | UNITED KINGDOM
Holdings [Line Items]
Percent of Net Asset Value	15.90%
Columbia Acorn International® Institutional Class | SWEDEN
Holdings [Line Items]
Percent of Net Asset Value	5.50%
Columbia Acorn International® Institutional Class | SWITZERLAND
Holdings [Line Items]
Percent of Net Asset Value	6%
Columbia Acorn International® Institutional Class | GERMANY
Holdings [Line Items]
Percent of Net Asset Value	7.40%
Columbia Acorn International® Institutional Class | NETHERLANDS
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn International® Institutional Class | Non-US [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.30%
Columbia Acorn International® Institutional Class | JAPAN
Holdings [Line Items]
Percent of Net Asset Value	18.60%
Columbia Acorn International® Institutional Class | CANADA
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Columbia Acorn International® Institutional Class | AUSTRALIA
Holdings [Line Items]
Percent of Net Asset Value	5.60%
Columbia Acorn International® Institutional Class | TAIWAN
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Columbia Acorn International® Institutional Class | MEXICO
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn International® Advisor Class | Intermediate Capital Group PLC [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Acorn International® Advisor Class | Auto Trader Group PLC [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn International® Advisor Class | Belimo Holding AG, Registered Shares [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Columbia Acorn International® Advisor Class | Munters Group AB [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn International® Advisor Class | Hexagon AB, Class B [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Acorn International® Advisor Class | Recruit Holdings Co., Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Acorn International® Advisor Class | Hypoport SE [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn International® Advisor Class | Pro Medicus Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn International® Advisor Class | IMCD NV [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Acorn International® Advisor Class | CCL Industries, Inc., Class B [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Acorn International® Advisor Class | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.70%
Columbia Acorn International® Advisor Class | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.70%
Columbia Acorn International® Advisor Class | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.50%
Columbia Acorn International® Advisor Class | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.10%
Columbia Acorn International® Advisor Class | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Acorn International® Advisor Class | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.10%
Columbia Acorn International® Advisor Class | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Columbia Acorn International® Advisor Class | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.90%
Columbia Acorn International® Advisor Class | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Acorn International® Advisor Class | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Acorn International® Advisor Class | UNITED KINGDOM
Holdings [Line Items]
Percent of Net Asset Value	15.90%
Columbia Acorn International® Advisor Class | SWEDEN
Holdings [Line Items]
Percent of Net Asset Value	5.50%
Columbia Acorn International® Advisor Class | SWITZERLAND
Holdings [Line Items]
Percent of Net Asset Value	6%
Columbia Acorn International® Advisor Class | GERMANY
Holdings [Line Items]
Percent of Net Asset Value	7.40%
Columbia Acorn International® Advisor Class | NETHERLANDS
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn International® Advisor Class | Non-US [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.30%
Columbia Acorn International® Advisor Class | JAPAN
Holdings [Line Items]
Percent of Net Asset Value	18.60%
Columbia Acorn International® Advisor Class | CANADA
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Columbia Acorn International® Advisor Class | AUSTRALIA
Holdings [Line Items]
Percent of Net Asset Value	5.60%
Columbia Acorn International® Advisor Class | TAIWAN
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Columbia Acorn International® Advisor Class | MEXICO
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn International® Class A | Intermediate Capital Group PLC [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Acorn International® Class A | Auto Trader Group PLC [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn International® Class A | Belimo Holding AG, Registered Shares [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Columbia Acorn International® Class A | Munters Group AB [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn International® Class A | Hexagon AB, Class B [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Acorn International® Class A | Recruit Holdings Co., Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Acorn International® Class A | Hypoport SE [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn International® Class A | Pro Medicus Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn International® Class A | IMCD NV [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Columbia Acorn International® Class A | CCL Industries, Inc., Class B [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Acorn International® Class A | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.70%
Columbia Acorn International® Class A | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	23.70%
Columbia Acorn International® Class A | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.50%
Columbia Acorn International® Class A | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.10%
Columbia Acorn International® Class A | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Acorn International® Class A | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.10%
Columbia Acorn International® Class A | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Columbia Acorn International® Class A | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.90%
Columbia Acorn International® Class A | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.50%
Columbia Acorn International® Class A | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.80%
Columbia Acorn International® Class A | UNITED KINGDOM
Holdings [Line Items]
Percent of Net Asset Value	15.90%
Columbia Acorn International® Class A | SWEDEN
Holdings [Line Items]
Percent of Net Asset Value	5.50%
Columbia Acorn International® Class A | SWITZERLAND
Holdings [Line Items]
Percent of Net Asset Value	6%
Columbia Acorn International® Class A | GERMANY
Holdings [Line Items]
Percent of Net Asset Value	7.40%
Columbia Acorn International® Class A | NETHERLANDS
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn International® Class A | Non-US [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.30%
Columbia Acorn International® Class A | JAPAN
Holdings [Line Items]
Percent of Net Asset Value	18.60%
Columbia Acorn International® Class A | CANADA
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Columbia Acorn International® Class A | AUSTRALIA
Holdings [Line Items]
Percent of Net Asset Value	5.60%
Columbia Acorn International® Class A | TAIWAN
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Columbia Acorn International® Class A | MEXICO
Holdings [Line Items]
Percent of Net Asset Value	4%
Columbia Acorn® Fund Institutional 3 Class | Churchill Downs, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Acorn® Fund Institutional 3 Class | SPX Technologies, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Acorn® Fund Institutional 3 Class | Bio-Techne Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Acorn® Fund Institutional 3 Class | Five Below, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn® Fund Institutional 3 Class | BJ's Wholesale Club Holdings, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Acorn® Fund Institutional 3 Class | Parsons Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Acorn® Fund Institutional 3 Class | Natera, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Institutional 3 Class | Colliers International Group, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Institutional 3 Class | Ryan Specialty Holdings, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Institutional 3 Class | WillScot Mobile Mini Holdings Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Institutional 3 Class | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	22.40%
Columbia Acorn® Fund Institutional 3 Class | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.20%
Columbia Acorn® Fund Institutional 3 Class | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.70%
Columbia Acorn® Fund Institutional 3 Class | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.90%
Columbia Acorn® Fund Institutional 3 Class | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.60%
Columbia Acorn® Fund Institutional 3 Class | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Acorn® Fund Institutional 3 Class | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Institutional 3 Class | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.20%
Columbia Acorn® Fund Institutional 3 Class | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Institutional 3 Class | Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Columbia Acorn® Fund Institutional 3 Class | ExchangeTraded Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Acorn® Fund Institutional 3 Class | Common Stocks [Member]
Holdings [Line Items]
Percent of Net Asset Value	97.90%
Columbia Acorn® Fund Institutional 3 Class | Money Market Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Acorn® Fund Institutional 3 Class | Securities Lending Collateral [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Acorn® Fund Institutional 2 Class | Churchill Downs, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Acorn® Fund Institutional 2 Class | SPX Technologies, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Acorn® Fund Institutional 2 Class | Bio-Techne Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Acorn® Fund Institutional 2 Class | Five Below, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn® Fund Institutional 2 Class | BJ's Wholesale Club Holdings, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Acorn® Fund Institutional 2 Class | Parsons Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Acorn® Fund Institutional 2 Class | Natera, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Institutional 2 Class | Colliers International Group, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Institutional 2 Class | Ryan Specialty Holdings, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Institutional 2 Class | WillScot Mobile Mini Holdings Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Institutional 2 Class | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	22.40%
Columbia Acorn® Fund Institutional 2 Class | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.20%
Columbia Acorn® Fund Institutional 2 Class | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.70%
Columbia Acorn® Fund Institutional 2 Class | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.90%
Columbia Acorn® Fund Institutional 2 Class | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.60%
Columbia Acorn® Fund Institutional 2 Class | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Acorn® Fund Institutional 2 Class | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Institutional 2 Class | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.20%
Columbia Acorn® Fund Institutional 2 Class | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Institutional 2 Class | Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Columbia Acorn® Fund Institutional 2 Class | ExchangeTraded Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Acorn® Fund Institutional 2 Class | Common Stocks [Member]
Holdings [Line Items]
Percent of Net Asset Value	97.90%
Columbia Acorn® Fund Institutional 2 Class | Money Market Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Acorn® Fund Institutional 2 Class | Securities Lending Collateral [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Acorn® Fund Institutional Class | Churchill Downs, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Acorn® Fund Institutional Class | SPX Technologies, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Acorn® Fund Institutional Class | Bio-Techne Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Acorn® Fund Institutional Class | Five Below, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn® Fund Institutional Class | BJ's Wholesale Club Holdings, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Acorn® Fund Institutional Class | Parsons Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Acorn® Fund Institutional Class | Natera, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Institutional Class | Colliers International Group, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Institutional Class | Ryan Specialty Holdings, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Institutional Class | WillScot Mobile Mini Holdings Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Institutional Class | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	22.40%
Columbia Acorn® Fund Institutional Class | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.20%
Columbia Acorn® Fund Institutional Class | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.70%
Columbia Acorn® Fund Institutional Class | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.90%
Columbia Acorn® Fund Institutional Class | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.60%
Columbia Acorn® Fund Institutional Class | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Acorn® Fund Institutional Class | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Institutional Class | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.20%
Columbia Acorn® Fund Institutional Class | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Institutional Class | Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Columbia Acorn® Fund Institutional Class | ExchangeTraded Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Acorn® Fund Institutional Class | Common Stocks [Member]
Holdings [Line Items]
Percent of Net Asset Value	97.90%
Columbia Acorn® Fund Institutional Class | Money Market Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Acorn® Fund Institutional Class | Securities Lending Collateral [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Acorn® Fund Class C | Churchill Downs, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Acorn® Fund Class C | SPX Technologies, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Acorn® Fund Class C | Bio-Techne Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Acorn® Fund Class C | Five Below, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn® Fund Class C | BJ's Wholesale Club Holdings, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Acorn® Fund Class C | Parsons Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Acorn® Fund Class C | Natera, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Class C | Colliers International Group, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Class C | Ryan Specialty Holdings, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Class C | WillScot Mobile Mini Holdings Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Class C | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	22.40%
Columbia Acorn® Fund Class C | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.20%
Columbia Acorn® Fund Class C | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.70%
Columbia Acorn® Fund Class C | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.90%
Columbia Acorn® Fund Class C | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.60%
Columbia Acorn® Fund Class C | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Acorn® Fund Class C | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Class C | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.20%
Columbia Acorn® Fund Class C | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Class C | Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Columbia Acorn® Fund Class C | ExchangeTraded Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Acorn® Fund Class C | Common Stocks [Member]
Holdings [Line Items]
Percent of Net Asset Value	97.90%
Columbia Acorn® Fund Class C | Money Market Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Acorn® Fund Class C | Securities Lending Collateral [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Acorn® Fund Advisor Class | Churchill Downs, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Acorn® Fund Advisor Class | SPX Technologies, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Acorn® Fund Advisor Class | Bio-Techne Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Acorn® Fund Advisor Class | Five Below, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn® Fund Advisor Class | BJ's Wholesale Club Holdings, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Acorn® Fund Advisor Class | Parsons Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Acorn® Fund Advisor Class | Natera, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Advisor Class | Colliers International Group, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Advisor Class | Ryan Specialty Holdings, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Advisor Class | WillScot Mobile Mini Holdings Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Advisor Class | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	22.40%
Columbia Acorn® Fund Advisor Class | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.20%
Columbia Acorn® Fund Advisor Class | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.70%
Columbia Acorn® Fund Advisor Class | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.90%
Columbia Acorn® Fund Advisor Class | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.60%
Columbia Acorn® Fund Advisor Class | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Acorn® Fund Advisor Class | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Advisor Class | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.20%
Columbia Acorn® Fund Advisor Class | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Advisor Class | Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Columbia Acorn® Fund Advisor Class | ExchangeTraded Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Acorn® Fund Advisor Class | Common Stocks [Member]
Holdings [Line Items]
Percent of Net Asset Value	97.90%
Columbia Acorn® Fund Advisor Class | Money Market Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Acorn® Fund Advisor Class | Securities Lending Collateral [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Acorn® Fund Class A | Churchill Downs, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Acorn® Fund Class A | SPX Technologies, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Acorn® Fund Class A | Bio-Techne Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Acorn® Fund Class A | Five Below, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
Columbia Acorn® Fund Class A | BJ's Wholesale Club Holdings, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Acorn® Fund Class A | Parsons Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Acorn® Fund Class A | Natera, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Class A | Colliers International Group, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Class A | Ryan Specialty Holdings, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Class A | WillScot Mobile Mini Holdings Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Class A | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	22.40%
Columbia Acorn® Fund Class A | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.20%
Columbia Acorn® Fund Class A | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.70%
Columbia Acorn® Fund Class A | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.90%
Columbia Acorn® Fund Class A | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.60%
Columbia Acorn® Fund Class A | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3%
Columbia Acorn® Fund Class A | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Class A | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	19.20%
Columbia Acorn® Fund Class A | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2%
Columbia Acorn® Fund Class A | Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Columbia Acorn® Fund Class A | ExchangeTraded Equity Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Acorn® Fund Class A | Common Stocks [Member]
Holdings [Line Items]
Percent of Net Asset Value	97.90%
Columbia Acorn® Fund Class A | Money Market Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Acorn® Fund Class A | Securities Lending Collateral [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%