Columbia Balanced Fund (CBALX) N-CSRS 3 Jan 25 Certified semi-annual shareholder report (management investment company) Financial data

Form N-CSR Cover

Form N-CSR Cover	6 Months Ended
	Oct. 31, 2024
Shareholder Report [Line Items]
Document Type	N-CSRS
Amendment Flag	false
Registrant Name	Columbia Funds Series Trust I
Entity Central Index Key	0000773757
Entity Investment Company Type	N-1A
Document Period End Date	Oct. 31, 2024

Shareholder Report

Shareholder Report	6 Months Ended
	Oct. 31, 2024 USD ($) Holding
Shareholder Report [Line Items]
Document Type	N-CSRS
Amendment Flag	false
Registrant Name	Columbia Funds Series Trust I
Entity Central Index Key	0000773757
Entity Investment Company Type	N-1A
Document Period End Date	Oct. 31, 2024
Columbia Small Cap Value Fund I - Class A
Shareholder Report [Line Items]
Fund Name	Columbia Small Cap Value Fund I
Class Name	Class A
Trading Symbol	CSMIX
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 Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Class A $ 1.22 % (a) (a) Annualized.
Expenses Paid, Amount	$ 64
Expense Ratio, Percent	1.22%	[1]
Net Assets	$ 1,499,025,195
Holdings Count | Holding	222
Investment Company, Portfolio Turnover	26%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 222 Portfolio turnover for the reporting period 26%
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 co mp Top Holdings Summit Materials, Inc., Class A 1.5 % Essent Group Ltd. 1.3 % Kirby Corp. 1.2 % Moog, Inc., Class A 1.2 % Kindercare Learning Cos, Inc. 1.2 % National Fuel Gas Co. 1.1 % Macerich Co. (The) 1.1 % John Bean Technologies Corp. 1.0 % UFP Industries, Inc. 1.0 % TXNM Energy, Inc. 1.0 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Summit Materials, Inc., Class A 1.5 % Essent Group Ltd. 1.3 % Kirby Corp. 1.2 % Moog, Inc., Class A 1.2 % Kindercare Learning Cos, Inc. 1.2 % National Fuel Gas Co. 1.1 % Macerich Co. (The) 1.1 % John Bean Technologies Corp. 1.0 % UFP Industries, Inc. 1.0 % TXNM Energy, Inc. 1.0 %
Columbia Small Cap Value Fund I - Advisor Class
Shareholder Report [Line Items]
Fund Name	Columbia Small Cap Value Fund I
Class Name	Advisor Class
Trading Symbol	CVVRX
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 Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Advisor Class $ 0.97 % (a) (a) Annualized.
Expenses Paid, Amount	$ 51
Expense Ratio, Percent	0.97%	[1]
Net Assets	$ 1,499,025,195
Holdings Count | Holding	222
Investment Company, Portfolio Turnover	26%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 222 Portfolio turnover for the reporting period 26%
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 Summit Materials, Inc., Class A 1.5 % Essent Group Ltd. 1.3 % Kirby Corp. 1.2 % Moog, Inc., Class A 1.2 % Kindercare Learning Cos, Inc. 1.2 % National Fuel Gas Co. 1.1 % Macerich Co. (The) 1.1 % John Bean Technologies Corp. 1.0 % UFP Industries, Inc. 1.0 % TXNM Energy, Inc. 1.0 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Summit Materials, Inc., Class A 1.5 % Essent Group Ltd. 1.3 % Kirby Corp. 1.2 % Moog, Inc., Class A 1.2 % Kindercare Learning Cos, Inc. 1.2 % National Fuel Gas Co. 1.1 % Macerich Co. (The) 1.1 % John Bean Technologies Corp. 1.0 % UFP Industries, Inc. 1.0 % TXNM Energy, Inc. 1.0 %
Columbia Small Cap Value Fund I - Class C
Shareholder Report [Line Items]
Fund Name	Columbia Small Cap Value Fund I
Class Name	Class C
Trading Symbol	CSSCX
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 Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Class C $ 1.97 % (a) (a) Annualized.
Expenses Paid, Amount	$ 103
Expense Ratio, Percent	1.97%	[1]
Net Assets	$ 1,499,025,195
Holdings Count | Holding	222
Investment Company, Portfolio Turnover	26%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 222 Portfolio turnover for the reporting period 26%
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 Summit Materials, Inc., Class A 1.5 % Essent Group Ltd. 1.3 % Kirby Corp. 1.2 % Moog, Inc., Class A 1.2 % Kindercare Learning Cos, Inc. 1.2 % National Fuel Gas Co. 1.1 % Macerich Co. (The) 1.1 % John Bean Technologies Corp. 1.0 % UFP Industries, Inc. 1.0 % TXNM Energy, Inc. 1.0 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Summit Materials, Inc., Class A 1.5 % Essent Group Ltd. 1.3 % Kirby Corp. 1.2 % Moog, Inc., Class A 1.2 % Kindercare Learning Cos, Inc. 1.2 % National Fuel Gas Co. 1.1 % Macerich Co. (The) 1.1 % John Bean Technologies Corp. 1.0 % UFP Industries, Inc. 1.0 % TXNM Energy, Inc. 1.0 %
Columbia Small Cap Value Fund I - Institutional Class
Shareholder Report [Line Items]
Fund Name	Columbia Small Cap Value Fund I
Class Name	Institutional Class
Trading Symbol	CSCZX
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 Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Institutional Class $ 0.97 % (a) (a) Annualized.
Expenses Paid, Amount	$ 51
Expense Ratio, Percent	0.97%	[1]
Net Assets	$ 1,499,025,195
Holdings Count | Holding	222
Investment Company, Portfolio Turnover	26%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 222 Portfolio turnover for the reporting period 26%
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 Summit Materials, Inc., Class A 1.5 % Essent Group Ltd. 1.3 % Kirby Corp. 1.2 % Moog, Inc., Class A 1.2 % Kindercare Learning Cos, Inc. 1.2 % National Fuel Gas Co. 1.1 % Macerich Co. (The) 1.1 % John Bean Technologies Corp. 1.0 % UFP Industries, Inc. 1.0 % TXNM Energy, Inc. 1.0 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Summit Materials, Inc., Class A 1.5 % Essent Group Ltd. 1.3 % Kirby Corp. 1.2 % Moog, Inc., Class A 1.2 % Kindercare Learning Cos, Inc. 1.2 % National Fuel Gas Co. 1.1 % Macerich Co. (The) 1.1 % John Bean Technologies Corp. 1.0 % UFP Industries, Inc. 1.0 % TXNM Energy, Inc. 1.0 %
Columbia Small Cap Value Fund I - Institutional 2 Class
Shareholder Report [Line Items]
Fund Name	Columbia Small Cap Value Fund I
Class Name	Institutional 2 Class
Trading Symbol	CUURX
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 Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Institutional 2 Class $ 0.88 % (a) (a) Annualized.
Expenses Paid, Amount	$ 46
Expense Ratio, Percent	0.88%	[1]
Net Assets	$ 1,499,025,195
Holdings Count | Holding	222
Investment Company, Portfolio Turnover	26%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 222 Portfolio turnover for the reporting period 26%
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 Summit Materials, Inc., Class A 1.5 % Essent Group Ltd. 1.3 % Kirby Corp. 1.2 % Moog, Inc., Class A 1.2 % Kindercare Learning Cos, Inc. 1.2 % National Fuel Gas Co. 1.1 % Macerich Co. (The) 1.1 % John Bean Technologies Corp. 1.0 % UFP Industries, Inc. 1.0 % TXNM Energy, Inc. 1.0 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Summit Materials, Inc., Class A 1.5 % Essent Group Ltd. 1.3 % Kirby Corp. 1.2 % Moog, Inc., Class A 1.2 % Kindercare Learning Cos, Inc. 1.2 % National Fuel Gas Co. 1.1 % Macerich Co. (The) 1.1 % John Bean Technologies Corp. 1.0 % UFP Industries, Inc. 1.0 % TXNM Energy, Inc. 1.0 %
Columbia Small Cap Value Fund I - Institutional 3 Class
Shareholder Report [Line Items]
Fund Name	Columbia Small Cap Value Fund I
Class Name	Institutional 3 Class
Trading Symbol	CSVYX
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 Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Institutional 3 Class $ 0.83 % (a) (a) Annualized.
Expenses Paid, Amount	$ 44
Expense Ratio, Percent	0.83%	[1]
Net Assets	$ 1,499,025,195
Holdings Count | Holding	222
Investment Company, Portfolio Turnover	26%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 222 Portfolio turnover for the reporting period 26%
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 Summit Materials, Inc., Class A 1.5 % Essent Group Ltd. 1.3 % Kirby Corp. 1.2 % Moog, Inc., Class A 1.2 % Kindercare Learning Cos, Inc. 1.2 % National Fuel Gas Co. 1.1 % Macerich Co. (The) 1.1 % John Bean Technologies Corp. 1.0 % UFP Industries, Inc. 1.0 % TXNM Energy, Inc. 1.0 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Summit Materials, Inc., Class A 1.5 % Essent Group Ltd. 1.3 % Kirby Corp. 1.2 % Moog, Inc., Class A 1.2 % Kindercare Learning Cos, Inc. 1.2 % National Fuel Gas Co. 1.1 % Macerich Co. (The) 1.1 % John Bean Technologies Corp. 1.0 % UFP Industries, Inc. 1.0 % TXNM Energy, Inc. 1.0 %
Columbia Small Cap Value Fund I - Class R
Shareholder Report [Line Items]
Fund Name	Columbia Small Cap Value Fund I
Class Name	Class R
Trading Symbol	CSVRX
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 Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Class R $ 1.47 % (a) (a) Annualized.
Expenses Paid, Amount	$ 77
Expense Ratio, Percent	1.47%	[1]
Net Assets	$ 1,499,025,195
Holdings Count | Holding	222
Investment Company, Portfolio Turnover	26%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 222 Portfolio turnover for the reporting period 26%
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 Summit Materials, Inc., Class A 1.5 % Essent Group Ltd. 1.3 % Kirby Corp. 1.2 % Moog, Inc., Class A 1.2 % Kindercare Learning Cos, Inc. 1.2 % National Fuel Gas Co. 1.1 % Macerich Co. (The) 1.1 % John Bean Technologies Corp. 1.0 % UFP Industries, Inc. 1.0 % TXNM Energy, Inc. 1.0 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Summit Materials, Inc., Class A 1.5 % Essent Group Ltd. 1.3 % Kirby Corp. 1.2 % Moog, Inc., Class A 1.2 % Kindercare Learning Cos, Inc. 1.2 % National Fuel Gas Co. 1.1 % Macerich Co. (The) 1.1 % John Bean Technologies Corp. 1.0 % UFP Industries, Inc. 1.0 % TXNM Energy, Inc. 1.0 %
Columbia Small Cap Value Fund I - Class S
Shareholder Report [Line Items]
Fund Name	Columbia Small Cap Value Fund I
Class Name	Class S
Trading Symbol	CSCQX
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 Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Class S $ (a) 0.95 % (b) (a) Based on operations from October 2, 2024 (commencement of operations) through the stated period end. Had the class been open for the entire reporting period, expenses shown in the table above would have been higher. (b) Annualized.
Expenses Paid, Amount	$ 7	[2]
Expense Ratio, Percent	0.95%	[1]
Net Assets	$ 1,499,025,195
Holdings Count | Holding	222
Investment Company, Portfolio Turnover	26%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 222 Portfolio turnover for the reporting period 26%
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 Summit Materials, Inc., Class A 1.5 % Essent Group Ltd. 1.3 % Kirby Corp. 1.2 % Moog, Inc., Class A 1.2 % Kindercare Learning Cos, Inc. 1.2 % National Fuel Gas Co. 1.1 % Macerich Co. (The) 1.1 % John Bean Technologies Corp. 1.0 % UFP Industries, Inc. 1.0 % TXNM Energy, Inc. 1.0 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Summit Materials, Inc., Class A 1.5 % Essent Group Ltd. 1.3 % Kirby Corp. 1.2 % Moog, Inc., Class A 1.2 % Kindercare Learning Cos, Inc. 1.2 % National Fuel Gas Co. 1.1 % Macerich Co. (The) 1.1 % John Bean Technologies Corp. 1.0 % UFP Industries, Inc. 1.0 % TXNM Energy, Inc. 1.0 %
[1]Annualized.[2]Based on operations from October 2, 2024 (commencement of operations) through the stated period end. Had the class been open for the entire reporting period, expenses shown in the table above would have been higher.

Shareholder Report, Holdings (D

Shareholder Report, Holdings (Details)	Oct. 31, 2024
Columbia Small Cap Value Fund I - Class A | Summit Materials, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Columbia Small Cap Value Fund I - Class A | Essent Group Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Small Cap Value Fund I - Class A | Kirby Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Class A | Moog, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Class A | Kindercare Learning Cos, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Class A | National Fuel Gas Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Class A | Macerich Co. (The) [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Class A | John Bean Technologies Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Class A | UFP Industries, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Class A | TXNM Energy, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Class A | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.10%
Columbia Small Cap Value Fund I - Class A | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.80%
Columbia Small Cap Value Fund I - Class A | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.10%
Columbia Small Cap Value Fund I - Class A | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.60%
Columbia Small Cap Value Fund I - Class A | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Small Cap Value Fund I - Class A | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.20%
Columbia Small Cap Value Fund I - Class A | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Columbia Small Cap Value Fund I - Class A | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Columbia Small Cap Value Fund I - Class A | Utilities Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.50%
Columbia Small Cap Value Fund I - Class A | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.20%
Columbia Small Cap Value Fund I - Class A | Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Columbia Small Cap Value Fund I - Class A | Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.30%
Columbia Small Cap Value Fund I - Class A | Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.10%
Columbia Small Cap Value Fund I - Advisor Class | Summit Materials, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Columbia Small Cap Value Fund I - Advisor Class | Essent Group Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Small Cap Value Fund I - Advisor Class | Kirby Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Advisor Class | Moog, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Advisor Class | Kindercare Learning Cos, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Advisor Class | National Fuel Gas Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Advisor Class | Macerich Co. (The) [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Advisor Class | John Bean Technologies Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Advisor Class | UFP Industries, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Advisor Class | TXNM Energy, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Advisor Class | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.10%
Columbia Small Cap Value Fund I - Advisor Class | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.80%
Columbia Small Cap Value Fund I - Advisor Class | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.10%
Columbia Small Cap Value Fund I - Advisor Class | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.60%
Columbia Small Cap Value Fund I - Advisor Class | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Small Cap Value Fund I - Advisor Class | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.20%
Columbia Small Cap Value Fund I - Advisor Class | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Columbia Small Cap Value Fund I - Advisor Class | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Columbia Small Cap Value Fund I - Advisor Class | Utilities Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.50%
Columbia Small Cap Value Fund I - Advisor Class | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.20%
Columbia Small Cap Value Fund I - Advisor Class | Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Columbia Small Cap Value Fund I - Advisor Class | Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.30%
Columbia Small Cap Value Fund I - Advisor Class | Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.10%
Columbia Small Cap Value Fund I - Class C | Summit Materials, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Columbia Small Cap Value Fund I - Class C | Essent Group Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Small Cap Value Fund I - Class C | Kirby Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Class C | Moog, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Class C | Kindercare Learning Cos, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Class C | National Fuel Gas Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Class C | Macerich Co. (The) [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Class C | John Bean Technologies Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Class C | UFP Industries, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Class C | TXNM Energy, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Class C | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.10%
Columbia Small Cap Value Fund I - Class C | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.80%
Columbia Small Cap Value Fund I - Class C | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.10%
Columbia Small Cap Value Fund I - Class C | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.60%
Columbia Small Cap Value Fund I - Class C | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Small Cap Value Fund I - Class C | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.20%
Columbia Small Cap Value Fund I - Class C | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Columbia Small Cap Value Fund I - Class C | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Columbia Small Cap Value Fund I - Class C | Utilities Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.50%
Columbia Small Cap Value Fund I - Class C | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.20%
Columbia Small Cap Value Fund I - Class C | Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Columbia Small Cap Value Fund I - Class C | Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.30%
Columbia Small Cap Value Fund I - Class C | Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.10%
Columbia Small Cap Value Fund I - Institutional Class | Summit Materials, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Columbia Small Cap Value Fund I - Institutional Class | Essent Group Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Small Cap Value Fund I - Institutional Class | Kirby Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Institutional Class | Moog, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Institutional Class | Kindercare Learning Cos, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Institutional Class | National Fuel Gas Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Institutional Class | Macerich Co. (The) [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Institutional Class | John Bean Technologies Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Institutional Class | UFP Industries, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Institutional Class | TXNM Energy, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Institutional Class | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.10%
Columbia Small Cap Value Fund I - Institutional Class | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.80%
Columbia Small Cap Value Fund I - Institutional Class | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.10%
Columbia Small Cap Value Fund I - Institutional Class | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.60%
Columbia Small Cap Value Fund I - Institutional Class | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Small Cap Value Fund I - Institutional Class | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.20%
Columbia Small Cap Value Fund I - Institutional Class | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Columbia Small Cap Value Fund I - Institutional Class | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Columbia Small Cap Value Fund I - Institutional Class | Utilities Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.50%
Columbia Small Cap Value Fund I - Institutional Class | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.20%
Columbia Small Cap Value Fund I - Institutional Class | Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Columbia Small Cap Value Fund I - Institutional Class | Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.30%
Columbia Small Cap Value Fund I - Institutional Class | Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.10%
Columbia Small Cap Value Fund I - Institutional 2 Class | Summit Materials, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Columbia Small Cap Value Fund I - Institutional 2 Class | Essent Group Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Small Cap Value Fund I - Institutional 2 Class | Kirby Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Institutional 2 Class | Moog, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Institutional 2 Class | Kindercare Learning Cos, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Institutional 2 Class | National Fuel Gas Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Institutional 2 Class | Macerich Co. (The) [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Institutional 2 Class | John Bean Technologies Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Institutional 2 Class | UFP Industries, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Institutional 2 Class | TXNM Energy, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Institutional 2 Class | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.10%
Columbia Small Cap Value Fund I - Institutional 2 Class | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.80%
Columbia Small Cap Value Fund I - Institutional 2 Class | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.10%
Columbia Small Cap Value Fund I - Institutional 2 Class | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.60%
Columbia Small Cap Value Fund I - Institutional 2 Class | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Small Cap Value Fund I - Institutional 2 Class | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.20%
Columbia Small Cap Value Fund I - Institutional 2 Class | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Columbia Small Cap Value Fund I - Institutional 2 Class | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Columbia Small Cap Value Fund I - Institutional 2 Class | Utilities Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.50%
Columbia Small Cap Value Fund I - Institutional 2 Class | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.20%
Columbia Small Cap Value Fund I - Institutional 2 Class | Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Columbia Small Cap Value Fund I - Institutional 2 Class | Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.30%
Columbia Small Cap Value Fund I - Institutional 2 Class | Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.10%
Columbia Small Cap Value Fund I - Institutional 3 Class | Summit Materials, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Columbia Small Cap Value Fund I - Institutional 3 Class | Essent Group Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Small Cap Value Fund I - Institutional 3 Class | Kirby Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Institutional 3 Class | Moog, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Institutional 3 Class | Kindercare Learning Cos, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Institutional 3 Class | National Fuel Gas Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Institutional 3 Class | Macerich Co. (The) [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Institutional 3 Class | John Bean Technologies Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Institutional 3 Class | UFP Industries, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Institutional 3 Class | TXNM Energy, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Institutional 3 Class | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.10%
Columbia Small Cap Value Fund I - Institutional 3 Class | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.80%
Columbia Small Cap Value Fund I - Institutional 3 Class | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.10%
Columbia Small Cap Value Fund I - Institutional 3 Class | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.60%
Columbia Small Cap Value Fund I - Institutional 3 Class | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Small Cap Value Fund I - Institutional 3 Class | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.20%
Columbia Small Cap Value Fund I - Institutional 3 Class | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Columbia Small Cap Value Fund I - Institutional 3 Class | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Columbia Small Cap Value Fund I - Institutional 3 Class | Utilities Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.50%
Columbia Small Cap Value Fund I - Institutional 3 Class | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.20%
Columbia Small Cap Value Fund I - Institutional 3 Class | Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Columbia Small Cap Value Fund I - Institutional 3 Class | Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.30%
Columbia Small Cap Value Fund I - Institutional 3 Class | Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.10%
Columbia Small Cap Value Fund I - Class R | Summit Materials, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Columbia Small Cap Value Fund I - Class R | Essent Group Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Small Cap Value Fund I - Class R | Kirby Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Class R | Moog, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Class R | Kindercare Learning Cos, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Class R | National Fuel Gas Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Class R | Macerich Co. (The) [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Class R | John Bean Technologies Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Class R | UFP Industries, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Class R | TXNM Energy, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Class R | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.10%
Columbia Small Cap Value Fund I - Class R | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.80%
Columbia Small Cap Value Fund I - Class R | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.10%
Columbia Small Cap Value Fund I - Class R | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.60%
Columbia Small Cap Value Fund I - Class R | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Small Cap Value Fund I - Class R | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.20%
Columbia Small Cap Value Fund I - Class R | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Columbia Small Cap Value Fund I - Class R | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Columbia Small Cap Value Fund I - Class R | Utilities Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.50%
Columbia Small Cap Value Fund I - Class R | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.20%
Columbia Small Cap Value Fund I - Class R | Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Columbia Small Cap Value Fund I - Class R | Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.30%
Columbia Small Cap Value Fund I - Class R | Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.10%
Columbia Small Cap Value Fund I - Class S | Summit Materials, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Columbia Small Cap Value Fund I - Class S | Essent Group Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Small Cap Value Fund I - Class S | Kirby Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Class S | Moog, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Class S | Kindercare Learning Cos, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Small Cap Value Fund I - Class S | National Fuel Gas Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Class S | Macerich Co. (The) [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Class S | John Bean Technologies Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Class S | UFP Industries, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Class S | TXNM Energy, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1%
Columbia Small Cap Value Fund I - Class S | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.10%
Columbia Small Cap Value Fund I - Class S | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.80%
Columbia Small Cap Value Fund I - Class S | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.10%
Columbia Small Cap Value Fund I - Class S | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.60%
Columbia Small Cap Value Fund I - Class S | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Small Cap Value Fund I - Class S | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.20%
Columbia Small Cap Value Fund I - Class S | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Columbia Small Cap Value Fund I - Class S | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.20%
Columbia Small Cap Value Fund I - Class S | Utilities Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.50%
Columbia Small Cap Value Fund I - Class S | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.20%
Columbia Small Cap Value Fund I - Class S | Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Columbia Small Cap Value Fund I - Class S | Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.30%
Columbia Small Cap Value Fund I - Class S | Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.10%