Shareholder Report, Holdings (Details)	Jul. 31, 2025
Columbia Strategic Municipal Income Fund - Class A \| NEW YORK
Holdings [Line Items]
Percent of Net Asset Value	12.00%
Columbia Strategic Municipal Income Fund - Class A \| TEXAS
Holdings [Line Items]
Percent of Net Asset Value	11.20%
Columbia Strategic Municipal Income Fund - Class A \| ILLINOIS
Holdings [Line Items]
Percent of Net Asset Value	9.10%
Columbia Strategic Municipal Income Fund - Class A \| CALIFORNIA
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Columbia Strategic Municipal Income Fund - Class A \| NEW JERSEY
Holdings [Line Items]
Percent of Net Asset Value	4.70%
Columbia Strategic Municipal Income Fund - Class A \| PENNSYLVANIA
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Columbia Strategic Municipal Income Fund - Class A \| WISCONSIN
Holdings [Line Items]
Percent of Net Asset Value	4.00%
Columbia Strategic Municipal Income Fund - Class A \| MICHIGAN
Holdings [Line Items]
Percent of Net Asset Value	3.40%
Columbia Strategic Municipal Income Fund - Class A \| OHIO
Holdings [Line Items]
Percent of Net Asset Value	3.40%
Columbia Strategic Municipal Income Fund - Class A \| PUERTO RICO
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Columbia Strategic Municipal Income Fund - Class A \| Municipal Bonds [Member]
Holdings [Line Items]
Percent of Net Asset Value	96.70%
Columbia Strategic Municipal Income Fund - Class A \| Money Market Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Strategic Municipal Income Fund - Class A \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Strategic Municipal Income Fund - Class C \| NEW YORK
Holdings [Line Items]
Percent of Net Asset Value	12.00%
Columbia Strategic Municipal Income Fund - Class C \| TEXAS
Holdings [Line Items]
Percent of Net Asset Value	11.20%
Columbia Strategic Municipal Income Fund - Class C \| ILLINOIS
Holdings [Line Items]
Percent of Net Asset Value	9.10%
Columbia Strategic Municipal Income Fund - Class C \| CALIFORNIA
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Columbia Strategic Municipal Income Fund - Class C \| NEW JERSEY
Holdings [Line Items]
Percent of Net Asset Value	4.70%
Columbia Strategic Municipal Income Fund - Class C \| PENNSYLVANIA
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Columbia Strategic Municipal Income Fund - Class C \| WISCONSIN
Holdings [Line Items]
Percent of Net Asset Value	4.00%
Columbia Strategic Municipal Income Fund - Class C \| MICHIGAN
Holdings [Line Items]
Percent of Net Asset Value	3.40%
Columbia Strategic Municipal Income Fund - Class C \| OHIO
Holdings [Line Items]
Percent of Net Asset Value	3.40%
Columbia Strategic Municipal Income Fund - Class C \| PUERTO RICO
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Columbia Strategic Municipal Income Fund - Class C \| Municipal Bonds [Member]
Holdings [Line Items]
Percent of Net Asset Value	96.70%
Columbia Strategic Municipal Income Fund - Class C \| Money Market Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Strategic Municipal Income Fund - Class C \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Strategic Municipal Income Fund - Institutional Class \| NEW YORK
Holdings [Line Items]
Percent of Net Asset Value	12.00%
Columbia Strategic Municipal Income Fund - Institutional Class \| TEXAS
Holdings [Line Items]
Percent of Net Asset Value	11.20%
Columbia Strategic Municipal Income Fund - Institutional Class \| ILLINOIS
Holdings [Line Items]
Percent of Net Asset Value	9.10%
Columbia Strategic Municipal Income Fund - Institutional Class \| CALIFORNIA
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Columbia Strategic Municipal Income Fund - Institutional Class \| NEW JERSEY
Holdings [Line Items]
Percent of Net Asset Value	4.70%
Columbia Strategic Municipal Income Fund - Institutional Class \| PENNSYLVANIA
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Columbia Strategic Municipal Income Fund - Institutional Class \| WISCONSIN
Holdings [Line Items]
Percent of Net Asset Value	4.00%
Columbia Strategic Municipal Income Fund - Institutional Class \| MICHIGAN
Holdings [Line Items]
Percent of Net Asset Value	3.40%
Columbia Strategic Municipal Income Fund - Institutional Class \| OHIO
Holdings [Line Items]
Percent of Net Asset Value	3.40%
Columbia Strategic Municipal Income Fund - Institutional Class \| PUERTO RICO
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Columbia Strategic Municipal Income Fund - Institutional Class \| Municipal Bonds [Member]
Holdings [Line Items]
Percent of Net Asset Value	96.70%
Columbia Strategic Municipal Income Fund - Institutional Class \| Money Market Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Strategic Municipal Income Fund - Institutional Class \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Strategic Municipal Income Fund - Institutional 2 Class \| NEW YORK
Holdings [Line Items]
Percent of Net Asset Value	12.00%
Columbia Strategic Municipal Income Fund - Institutional 2 Class \| TEXAS
Holdings [Line Items]
Percent of Net Asset Value	11.20%
Columbia Strategic Municipal Income Fund - Institutional 2 Class \| ILLINOIS
Holdings [Line Items]
Percent of Net Asset Value	9.10%
Columbia Strategic Municipal Income Fund - Institutional 2 Class \| CALIFORNIA
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Columbia Strategic Municipal Income Fund - Institutional 2 Class \| NEW JERSEY
Holdings [Line Items]
Percent of Net Asset Value	4.70%
Columbia Strategic Municipal Income Fund - Institutional 2 Class \| PENNSYLVANIA
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Columbia Strategic Municipal Income Fund - Institutional 2 Class \| WISCONSIN
Holdings [Line Items]
Percent of Net Asset Value	4.00%
Columbia Strategic Municipal Income Fund - Institutional 2 Class \| MICHIGAN
Holdings [Line Items]
Percent of Net Asset Value	3.40%
Columbia Strategic Municipal Income Fund - Institutional 2 Class \| OHIO
Holdings [Line Items]
Percent of Net Asset Value	3.40%
Columbia Strategic Municipal Income Fund - Institutional 2 Class \| PUERTO RICO
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Columbia Strategic Municipal Income Fund - Institutional 2 Class \| Municipal Bonds [Member]
Holdings [Line Items]
Percent of Net Asset Value	96.70%
Columbia Strategic Municipal Income Fund - Institutional 2 Class \| Money Market Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Strategic Municipal Income Fund - Institutional 2 Class \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Strategic Municipal Income Fund - Institutional 3 Class \| NEW YORK
Holdings [Line Items]
Percent of Net Asset Value	12.00%
Columbia Strategic Municipal Income Fund - Institutional 3 Class \| TEXAS
Holdings [Line Items]
Percent of Net Asset Value	11.20%
Columbia Strategic Municipal Income Fund - Institutional 3 Class \| ILLINOIS
Holdings [Line Items]
Percent of Net Asset Value	9.10%
Columbia Strategic Municipal Income Fund - Institutional 3 Class \| CALIFORNIA
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Columbia Strategic Municipal Income Fund - Institutional 3 Class \| NEW JERSEY
Holdings [Line Items]
Percent of Net Asset Value	4.70%
Columbia Strategic Municipal Income Fund - Institutional 3 Class \| PENNSYLVANIA
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Columbia Strategic Municipal Income Fund - Institutional 3 Class \| WISCONSIN
Holdings [Line Items]
Percent of Net Asset Value	4.00%
Columbia Strategic Municipal Income Fund - Institutional 3 Class \| MICHIGAN
Holdings [Line Items]
Percent of Net Asset Value	3.40%
Columbia Strategic Municipal Income Fund - Institutional 3 Class \| OHIO
Holdings [Line Items]
Percent of Net Asset Value	3.40%
Columbia Strategic Municipal Income Fund - Institutional 3 Class \| PUERTO RICO
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Columbia Strategic Municipal Income Fund - Institutional 3 Class \| Municipal Bonds [Member]
Holdings [Line Items]
Percent of Net Asset Value	96.70%
Columbia Strategic Municipal Income Fund - Institutional 3 Class \| Money Market Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Strategic Municipal Income Fund - Institutional 3 Class \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%
Columbia Strategic Municipal Income Fund - Class S \| NEW YORK
Holdings [Line Items]
Percent of Net Asset Value	12.00%
Columbia Strategic Municipal Income Fund - Class S \| TEXAS
Holdings [Line Items]
Percent of Net Asset Value	11.20%
Columbia Strategic Municipal Income Fund - Class S \| ILLINOIS
Holdings [Line Items]
Percent of Net Asset Value	9.10%
Columbia Strategic Municipal Income Fund - Class S \| CALIFORNIA
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Columbia Strategic Municipal Income Fund - Class S \| NEW JERSEY
Holdings [Line Items]
Percent of Net Asset Value	4.70%
Columbia Strategic Municipal Income Fund - Class S \| PENNSYLVANIA
Holdings [Line Items]
Percent of Net Asset Value	4.30%
Columbia Strategic Municipal Income Fund - Class S \| WISCONSIN
Holdings [Line Items]
Percent of Net Asset Value	4.00%
Columbia Strategic Municipal Income Fund - Class S \| MICHIGAN
Holdings [Line Items]
Percent of Net Asset Value	3.40%
Columbia Strategic Municipal Income Fund - Class S \| OHIO
Holdings [Line Items]
Percent of Net Asset Value	3.40%
Columbia Strategic Municipal Income Fund - Class S \| PUERTO RICO
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Columbia Strategic Municipal Income Fund - Class S \| Municipal Bonds [Member]
Holdings [Line Items]
Percent of Net Asset Value	96.70%
Columbia Strategic Municipal Income Fund - Class S \| Money Market Funds [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Strategic Municipal Income Fund - Class S \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%

Shareholder Report, Holdings (Details)

Jul. 31, 2025