Columbia Funds Series Trust N-CSRS 5 Nov 24 Certified semi-annual shareholder report (management investment company) Financial data

Form N-CSR Cover

Form N-CSR Cover	6 Months Ended
	Aug. 31, 2024
Shareholder Report [Line Items]
Document Type	N-CSRS
Amendment Flag	false
Registrant Name	Columbia Funds Series Trust
Entity Central Index Key	0001097519
Entity Investment Company Type	N-1A
Document Period End Date	Aug. 31, 2024

Shareholder Report

Shareholder Report	6 Months Ended
	Aug. 31, 2024 USD ($) Holding
Shareholder Report [Line Items]
Document Type	N-CSRS
Amendment Flag	false
Registrant Name	Columbia Funds Series Trust
Entity Central Index Key	0001097519
Entity Investment Company Type	N-1A
Document Period End Date	Aug. 31, 2024
Columbia Mid Cap Index Fund (Class A)
Shareholder Report [Line Items]
Fund Name	Columbia Mid Cap Index Fund
Class Name	Class A
Trading Symbol	NTIAX
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 $ 0.45 %
Expenses Paid, Amount	$ 23
Expense Ratio, Percent	0.45%
Net Assets	$ 2,661,799,515
Holdings Count | Holding	403
Investment Company, Portfolio Turnover	9%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 403 Portfolio tu rnover for th 9%
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 Illumina, Inc. 0.7 % Carlisle Companies, Inc. 0.7 % Lennox International, Inc. 0.7 % EMCOR Group, Inc. 0.6 % Avantor, Inc. 0.6 % BioMarin Pharmaceutical, Inc. 0.6 % Williams-Sonoma, Inc. 0.6 % Burlington Stores, Inc. 0.6 % Reliance, Inc. 0.6 % Manhattan Associates, Inc. 0.6 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Illumina, Inc. 0.7 % Carlisle Companies, Inc. 0.7 % Lennox International, Inc. 0.7 % EMCOR Group, Inc. 0.6 % Avantor, Inc. 0.6 % BioMarin Pharmaceutical, Inc. 0.6 % Williams-Sonoma, Inc. 0.6 % Burlington Stores, Inc. 0.6 % Reliance, Inc. 0.6 % Manhattan Associates, Inc. 0.6 %
Columbia Mid Cap Index Fund (Institutional Class)
Shareholder Report [Line Items]
Fund Name	Columbia Mid Cap Index Fund
Class Name	Institutional Class
Trading Symbol	NMPAX
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 $ 0.20 %
Expenses Paid, Amount	$ 10
Expense Ratio, Percent	0.20%
Net Assets	$ 2,661,799,515
Holdings Count | Holding	403
Investment Company, Portfolio Turnover	9%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total n umber o 403 Portfolio turnover for the reporting period 9%
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 Illumina, Inc. 0.7 % Carlisle Companies, Inc. 0.7 % Lennox International, Inc. 0.7 % EMCOR Group, Inc. 0.6 % Avantor, Inc. 0.6 % BioMarin Pharmaceutical, Inc. 0.6 % Williams-Sonoma, Inc. 0.6 % Burlington Stores, Inc. 0.6 % Reliance, Inc. 0.6 % Manhatta n Ass 0.6 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Illumina, Inc. 0.7 % Carlisle Companies, Inc. 0.7 % Lennox International, Inc. 0.7 % EMCOR Group, Inc. 0.6 % Avantor, Inc. 0.6 % BioMarin Pharmaceutical, Inc. 0.6 % Williams-Sonoma, Inc. 0.6 % Burlington Stores, Inc. 0.6 % Reliance, Inc. 0.6 % Manhatta n Ass 0.6 %
Columbia Mid Cap Index Fund (Institutional 2 Class)
Shareholder Report [Line Items]
Fund Name	Columbia Mid Cap Index Fund
Class Name	Institutional 2 Class
Trading Symbol	CPXRX
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 $ 0.20 %
Expenses Paid, Amount	$ 10
Expense Ratio, Percent	0.20%
Net Assets	$ 2,661,799,515
Holdings Count | Holding	403
Investment Company, Portfolio Turnover	9%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfoli 403 Portfolio turnover for the reporting period 9%
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 Illumina, Inc. 0.7% Carlisle Companies, Inc. 0.7% Lennox International, Inc. 0.7% EMCOR Group, Inc. 0.6% Avantor, Inc. 0.6% BioMarin Pharmaceutical, Inc. 0.6% Williams-Sonoma, Inc. 0.6% Burlington Stores, Inc. 0.6% Reliance, Inc. 0.6% Manhattan Associates, Inc. 0.6% Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Illumina, Inc. 0.7% Carlisle Companies, Inc. 0.7% Lennox International, Inc. 0.7% EMCOR Group, Inc. 0.6% Avantor, Inc. 0.6% BioMarin Pharmaceutical, Inc. 0.6% Williams-Sonoma, Inc. 0.6% Burlington Stores, Inc. 0.6% Reliance, Inc. 0.6% Manhattan Associates, Inc. 0.6%
Columbia Mid Cap Index Fund (Institutional 3 Class)
Shareholder Report [Line Items]
Fund Name	Columbia Mid Cap Index Fund
Class Name	Institutional 3 Class
Trading Symbol	CMDYX
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 $ 0.20 %
Expenses Paid, Amount	$ 10
Expense Ratio, Percent	0.20%
Net Assets	$ 2,661,799,515
Holdings Count | Holding	403
Investment Company, Portfolio Turnover	9%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 403 Portfolio turnover for the reporting period 9%
Holdings [Text Block]	Graphical Representation of Fund The tables below show the investment makeup of the Fund represented as a perc Top Holdings Illumina, Inc. 0.7 % Carlisle Companies, Inc. 0.7 % Lennox International, Inc. 0.7 % EMCOR Group, Inc. 0.6 % Avantor, Inc. 0.6 % BioMarin Pharmaceutical, Inc. 0.6 % Williams-Sonoma, Inc. 0.6 % Burlington Stores, Inc. 0.6 % Reliance, Inc. 0.6 % Manhattan Associates, Inc. 0.6 % Asset Categories Equity Sector Allocation
Largest Holdings [Text Block]	Top Holdings Illumina, Inc. 0.7 % Carlisle Companies, Inc. 0.7 % Lennox International, Inc. 0.7 % EMCOR Group, Inc. 0.6 % Avantor, Inc. 0.6 % BioMarin Pharmaceutical, Inc. 0.6 % Williams-Sonoma, Inc. 0.6 % Burlington Stores, Inc. 0.6 % Reliance, Inc. 0.6 % Manhattan Associates, Inc. 0.6 %

Shareholder Report, Holdings (D

Shareholder Report, Holdings (Details)	Aug. 31, 2024
Columbia Mid Cap Index Fund (Institutional 3 Class) | Illumina, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Columbia Mid Cap Index Fund (Institutional 3 Class) | Carlisle Companies, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Columbia Mid Cap Index Fund (Institutional 3 Class) | Lennox International, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Columbia Mid Cap Index Fund (Institutional 3 Class) | EMCOR Group, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Institutional 3 Class) | Avantor, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Institutional 3 Class) | BioMarin Pharmaceutical, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Institutional 3 Class) | Williams-Sonoma, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Institutional 3 Class) | Burlington Stores, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Institutional 3 Class) | Reliance, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Institutional 3 Class) | Manhattan Associates, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Institutional 3 Class) | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.70%
Columbia Mid Cap Index Fund (Institutional 3 Class) | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.80%
Columbia Mid Cap Index Fund (Institutional 3 Class) | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.40%
Columbia Mid Cap Index Fund (Institutional 3 Class) | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.80%
Columbia Mid Cap Index Fund (Institutional 3 Class) | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Mid Cap Index Fund (Institutional 3 Class) | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Columbia Mid Cap Index Fund (Institutional 3 Class) | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.50%
Columbia Mid Cap Index Fund (Institutional 3 Class) | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5%
Columbia Mid Cap Index Fund (Institutional 3 Class) | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Columbia Mid Cap Index Fund (Institutional 3 Class) | Utilities Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Mid Cap Index Fund (Institutional 3 Class) | Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Columbia Mid Cap Index Fund (Institutional 3 Class) | Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	98.80%
Columbia Mid Cap Index Fund (Institutional 3 Class) | Money Market Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Mid Cap Index Fund (Institutional 2 Class) | Illumina, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Columbia Mid Cap Index Fund (Institutional 2 Class) | Carlisle Companies, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Columbia Mid Cap Index Fund (Institutional 2 Class) | Lennox International, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Columbia Mid Cap Index Fund (Institutional 2 Class) | EMCOR Group, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Institutional 2 Class) | Avantor, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Institutional 2 Class) | BioMarin Pharmaceutical, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Institutional 2 Class) | Williams-Sonoma, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Institutional 2 Class) | Burlington Stores, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Institutional 2 Class) | Reliance, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Institutional 2 Class) | Manhattan Associates, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Institutional 2 Class) | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.70%
Columbia Mid Cap Index Fund (Institutional 2 Class) | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.80%
Columbia Mid Cap Index Fund (Institutional 2 Class) | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.40%
Columbia Mid Cap Index Fund (Institutional 2 Class) | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.80%
Columbia Mid Cap Index Fund (Institutional 2 Class) | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Mid Cap Index Fund (Institutional 2 Class) | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Columbia Mid Cap Index Fund (Institutional 2 Class) | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.50%
Columbia Mid Cap Index Fund (Institutional 2 Class) | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5%
Columbia Mid Cap Index Fund (Institutional 2 Class) | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Columbia Mid Cap Index Fund (Institutional 2 Class) | Utilities Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Mid Cap Index Fund (Institutional 2 Class) | Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Columbia Mid Cap Index Fund (Institutional 2 Class) | Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	98.80%
Columbia Mid Cap Index Fund (Institutional 2 Class) | Money Market Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Mid Cap Index Fund (Institutional Class) | Illumina, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Columbia Mid Cap Index Fund (Institutional Class) | Carlisle Companies, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Columbia Mid Cap Index Fund (Institutional Class) | Lennox International, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Columbia Mid Cap Index Fund (Institutional Class) | EMCOR Group, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Institutional Class) | Avantor, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Institutional Class) | BioMarin Pharmaceutical, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Institutional Class) | Williams-Sonoma, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Institutional Class) | Burlington Stores, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Institutional Class) | Reliance, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Institutional Class) | Manhattan Associates, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Institutional Class) | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.70%
Columbia Mid Cap Index Fund (Institutional Class) | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.80%
Columbia Mid Cap Index Fund (Institutional Class) | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.40%
Columbia Mid Cap Index Fund (Institutional Class) | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.80%
Columbia Mid Cap Index Fund (Institutional Class) | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Mid Cap Index Fund (Institutional Class) | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Columbia Mid Cap Index Fund (Institutional Class) | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.50%
Columbia Mid Cap Index Fund (Institutional Class) | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5%
Columbia Mid Cap Index Fund (Institutional Class) | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Columbia Mid Cap Index Fund (Institutional Class) | Utilities Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Mid Cap Index Fund (Institutional Class) | Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Columbia Mid Cap Index Fund (Institutional Class) | Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	98.80%
Columbia Mid Cap Index Fund (Institutional Class) | Money Market Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Mid Cap Index Fund (Class A) | Illumina, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Columbia Mid Cap Index Fund (Class A) | Carlisle Companies, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Columbia Mid Cap Index Fund (Class A) | Lennox International, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%
Columbia Mid Cap Index Fund (Class A) | EMCOR Group, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Class A) | Avantor, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Class A) | BioMarin Pharmaceutical, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Class A) | Williams-Sonoma, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Class A) | Burlington Stores, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Class A) | Reliance, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Class A) | Manhattan Associates, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mid Cap Index Fund (Class A) | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.70%
Columbia Mid Cap Index Fund (Class A) | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.80%
Columbia Mid Cap Index Fund (Class A) | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.40%
Columbia Mid Cap Index Fund (Class A) | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.80%
Columbia Mid Cap Index Fund (Class A) | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Mid Cap Index Fund (Class A) | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.50%
Columbia Mid Cap Index Fund (Class A) | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.50%
Columbia Mid Cap Index Fund (Class A) | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5%
Columbia Mid Cap Index Fund (Class A) | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Columbia Mid Cap Index Fund (Class A) | Utilities Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.60%
Columbia Mid Cap Index Fund (Class A) | Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%
Columbia Mid Cap Index Fund (Class A) | Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	98.80%
Columbia Mid Cap Index Fund (Class A) | Money Market Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%