Shareholder Report, Holdings (Details)	Apr. 30, 2025
Columbia Small Cap Value Fund I - Class A \| National Fuel Gas Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.60%
Columbia Small Cap Value Fund I - Class A \| Popular, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Columbia Small Cap Value Fund I - Class A \| Essent Group Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Columbia Small Cap Value Fund I - Class A \| UGI Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Small Cap Value Fund I - Class A \| JBT Marel Corp. [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	1.30%
Columbia Small Cap Value Fund I - Class A \| StoneX Group, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Small Cap Value Fund I - Class A \| Telephone and Data Systems, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Class A \| Moog, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Class A \| MP Materials Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.00%
Columbia Small Cap Value Fund I - Class A \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.50%
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	10.10%
Columbia Small Cap Value Fund I - Class A \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.00%
Columbia Small Cap Value Fund I - Class A \| Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Columbia Small Cap Value Fund I - Class A \| Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.80%
Columbia Small Cap Value Fund I - Class A \| Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.30%
Columbia Small Cap Value Fund I - Class A \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.30%
Columbia Small Cap Value Fund I - Class A \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.80%
Columbia Small Cap Value Fund I - Class A \| Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%
Columbia Small Cap Value Fund I - Class A \| Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.30%
Columbia Small Cap Value Fund I - Class A \| Common Stocks [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.60%
Columbia Small Cap Value Fund I - Class C \| National Fuel Gas Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.60%
Columbia Small Cap Value Fund I - Class C \| Popular, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Columbia Small Cap Value Fund I - Class C \| Essent Group Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Columbia Small Cap Value Fund I - Class C \| UGI Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Small Cap Value Fund I - Class C \| JBT Marel Corp. [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	1.30%
Columbia Small Cap Value Fund I - Class C \| StoneX Group, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Small Cap Value Fund I - Class C \| Telephone and Data Systems, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Class C \| Moog, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Class C \| MP Materials Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.00%
Columbia Small Cap Value Fund I - Class C \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.50%
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	10.10%
Columbia Small Cap Value Fund I - Class C \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.00%
Columbia Small Cap Value Fund I - Class C \| Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Columbia Small Cap Value Fund I - Class C \| Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.80%
Columbia Small Cap Value Fund I - Class C \| Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.30%
Columbia Small Cap Value Fund I - Class C \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.30%
Columbia Small Cap Value Fund I - Class C \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.80%
Columbia Small Cap Value Fund I - Class C \| Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%
Columbia Small Cap Value Fund I - Class C \| Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.30%
Columbia Small Cap Value Fund I - Class C \| Common Stocks [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.60%
Columbia Small Cap Value Fund I - Institutional Class \| National Fuel Gas Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.60%
Columbia Small Cap Value Fund I - Institutional Class \| Popular, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Columbia Small Cap Value Fund I - Institutional Class \| Essent Group Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Columbia Small Cap Value Fund I - Institutional Class \| UGI Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Small Cap Value Fund I - Institutional Class \| JBT Marel Corp. [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	1.30%
Columbia Small Cap Value Fund I - Institutional Class \| StoneX Group, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Small Cap Value Fund I - Institutional Class \| Telephone and Data Systems, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Institutional Class \| Moog, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Institutional Class \| MP Materials Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.00%
Columbia Small Cap Value Fund I - Institutional Class \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.50%
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	10.10%
Columbia Small Cap Value Fund I - Institutional Class \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.00%
Columbia Small Cap Value Fund I - Institutional Class \| Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Columbia Small Cap Value Fund I - Institutional Class \| Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.80%
Columbia Small Cap Value Fund I - Institutional Class \| Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.30%
Columbia Small Cap Value Fund I - Institutional Class \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.30%
Columbia Small Cap Value Fund I - Institutional Class \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.80%
Columbia Small Cap Value Fund I - Institutional Class \| Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%
Columbia Small Cap Value Fund I - Institutional Class \| Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.30%
Columbia Small Cap Value Fund I - Institutional Class \| Common Stocks [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.60%
Columbia Small Cap Value Fund I - Institutional 2 Class \| National Fuel Gas Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.60%
Columbia Small Cap Value Fund I - Institutional 2 Class \| Popular, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Columbia Small Cap Value Fund I - Institutional 2 Class \| Essent Group Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Columbia Small Cap Value Fund I - Institutional 2 Class \| UGI Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Small Cap Value Fund I - Institutional 2 Class \| JBT Marel Corp. [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	1.30%
Columbia Small Cap Value Fund I - Institutional 2 Class \| StoneX Group, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Small Cap Value Fund I - Institutional 2 Class \| Telephone and Data Systems, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Institutional 2 Class \| Moog, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Institutional 2 Class \| MP Materials Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.00%
Columbia Small Cap Value Fund I - Institutional 2 Class \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.50%
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	10.10%
Columbia Small Cap Value Fund I - Institutional 2 Class \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.00%
Columbia Small Cap Value Fund I - Institutional 2 Class \| Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Columbia Small Cap Value Fund I - Institutional 2 Class \| Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.80%
Columbia Small Cap Value Fund I - Institutional 2 Class \| Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.30%
Columbia Small Cap Value Fund I - Institutional 2 Class \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.30%
Columbia Small Cap Value Fund I - Institutional 2 Class \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.80%
Columbia Small Cap Value Fund I - Institutional 2 Class \| Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%
Columbia Small Cap Value Fund I - Institutional 2 Class \| Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.30%
Columbia Small Cap Value Fund I - Institutional 2 Class \| Common Stocks [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.60%
Columbia Small Cap Value Fund I - Institutional 3 Class \| National Fuel Gas Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.60%
Columbia Small Cap Value Fund I - Institutional 3 Class \| Popular, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Columbia Small Cap Value Fund I - Institutional 3 Class \| Essent Group Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Columbia Small Cap Value Fund I - Institutional 3 Class \| UGI Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Small Cap Value Fund I - Institutional 3 Class \| JBT Marel Corp. [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	1.30%
Columbia Small Cap Value Fund I - Institutional 3 Class \| StoneX Group, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Small Cap Value Fund I - Institutional 3 Class \| Telephone and Data Systems, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Institutional 3 Class \| Moog, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Institutional 3 Class \| MP Materials Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.00%
Columbia Small Cap Value Fund I - Institutional 3 Class \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.50%
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	10.10%
Columbia Small Cap Value Fund I - Institutional 3 Class \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.00%
Columbia Small Cap Value Fund I - Institutional 3 Class \| Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Columbia Small Cap Value Fund I - Institutional 3 Class \| Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.80%
Columbia Small Cap Value Fund I - Institutional 3 Class \| Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.30%
Columbia Small Cap Value Fund I - Institutional 3 Class \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.30%
Columbia Small Cap Value Fund I - Institutional 3 Class \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.80%
Columbia Small Cap Value Fund I - Institutional 3 Class \| Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%
Columbia Small Cap Value Fund I - Institutional 3 Class \| Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.30%
Columbia Small Cap Value Fund I - Institutional 3 Class \| Common Stocks [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.60%
Columbia Small Cap Value Fund I - Class R \| National Fuel Gas Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.60%
Columbia Small Cap Value Fund I - Class R \| Popular, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Columbia Small Cap Value Fund I - Class R \| Essent Group Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Columbia Small Cap Value Fund I - Class R \| UGI Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Small Cap Value Fund I - Class R \| JBT Marel Corp. [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	1.30%
Columbia Small Cap Value Fund I - Class R \| StoneX Group, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Small Cap Value Fund I - Class R \| Telephone and Data Systems, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Class R \| Moog, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Class R \| MP Materials Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.00%
Columbia Small Cap Value Fund I - Class R \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.50%
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	10.10%
Columbia Small Cap Value Fund I - Class R \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.00%
Columbia Small Cap Value Fund I - Class R \| Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Columbia Small Cap Value Fund I - Class R \| Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.80%
Columbia Small Cap Value Fund I - Class R \| Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.30%
Columbia Small Cap Value Fund I - Class R \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.30%
Columbia Small Cap Value Fund I - Class R \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.80%
Columbia Small Cap Value Fund I - Class R \| Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%
Columbia Small Cap Value Fund I - Class R \| Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.30%
Columbia Small Cap Value Fund I - Class R \| Common Stocks [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.60%
Columbia Small Cap Value Fund I - Class S \| National Fuel Gas Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.60%
Columbia Small Cap Value Fund I - Class S \| Popular, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Columbia Small Cap Value Fund I - Class S \| Essent Group Ltd. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
Columbia Small Cap Value Fund I - Class S \| UGI Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Small Cap Value Fund I - Class S \| JBT Marel Corp. [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	1.30%
Columbia Small Cap Value Fund I - Class S \| StoneX Group, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Small Cap Value Fund I - Class S \| Telephone and Data Systems, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Class S \| Moog, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.10%
Columbia Small Cap Value Fund I - Class S \| MP Materials Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.00%
Columbia Small Cap Value Fund I - Class S \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.50%
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	10.10%
Columbia Small Cap Value Fund I - Class S \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.00%
Columbia Small Cap Value Fund I - Class S \| Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Columbia Small Cap Value Fund I - Class S \| Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.80%
Columbia Small Cap Value Fund I - Class S \| Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.30%
Columbia Small Cap Value Fund I - Class S \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.30%
Columbia Small Cap Value Fund I - Class S \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.80%
Columbia Small Cap Value Fund I - Class S \| Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%
Columbia Small Cap Value Fund I - Class S \| Unclassified Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.30%
Columbia Small Cap Value Fund I - Class S \| Common Stocks [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.60%

Shareholder Report, Holdings (Details)

Apr. 30, 2025