v3.25.2
Shareholder Report, Holdings (Details)
May 31, 2025
Columbia High Yield Municipal Fund - Class A | AAA Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Columbia High Yield Municipal Fund - Class A | AA Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
Columbia High Yield Municipal Fund - Class A | A Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
Columbia High Yield Municipal Fund - Class A | BBB Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
Columbia High Yield Municipal Fund - Class A | BB Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.30%
Columbia High Yield Municipal Fund - Class A | B Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Columbia High Yield Municipal Fund - Class A | CCC Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
Columbia High Yield Municipal Fund - Class A | Not Rated [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 58.60%
Columbia High Yield Municipal Fund - Class A | WISCONSIN  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
Columbia High Yield Municipal Fund - Class A | COLORADO  
Holdings [Line Items]  
Percent of Net Asset Value 8.60%
Columbia High Yield Municipal Fund - Class A | FLORIDA  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
Columbia High Yield Municipal Fund - Class A | TEXAS  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
Columbia High Yield Municipal Fund - Class A | ILLINOIS  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
Columbia High Yield Municipal Fund - Class A | CALIFORNIA  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
Columbia High Yield Municipal Fund - Class A | NEW YORK  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
Columbia High Yield Municipal Fund - Class A | NEW HAMPSHIRE  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Columbia High Yield Municipal Fund - Class A | OHIO  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Columbia High Yield Municipal Fund - Class A | PUERTO RICO  
Holdings [Line Items]  
Percent of Net Asset Value 6.60%
Columbia High Yield Municipal Fund - Class A | Municipal Bond [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 97.70%
Columbia High Yield Municipal Fund - Class A | Other [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Columbia High Yield Municipal Fund - Class C | AAA Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Columbia High Yield Municipal Fund - Class C | AA Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
Columbia High Yield Municipal Fund - Class C | A Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
Columbia High Yield Municipal Fund - Class C | BBB Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
Columbia High Yield Municipal Fund - Class C | BB Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.30%
Columbia High Yield Municipal Fund - Class C | B Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Columbia High Yield Municipal Fund - Class C | CCC Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
Columbia High Yield Municipal Fund - Class C | Not Rated [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 58.60%
Columbia High Yield Municipal Fund - Class C | WISCONSIN  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
Columbia High Yield Municipal Fund - Class C | COLORADO  
Holdings [Line Items]  
Percent of Net Asset Value 8.60%
Columbia High Yield Municipal Fund - Class C | FLORIDA  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
Columbia High Yield Municipal Fund - Class C | TEXAS  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
Columbia High Yield Municipal Fund - Class C | ILLINOIS  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
Columbia High Yield Municipal Fund - Class C | CALIFORNIA  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
Columbia High Yield Municipal Fund - Class C | NEW YORK  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
Columbia High Yield Municipal Fund - Class C | NEW HAMPSHIRE  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Columbia High Yield Municipal Fund - Class C | OHIO  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Columbia High Yield Municipal Fund - Class C | PUERTO RICO  
Holdings [Line Items]  
Percent of Net Asset Value 6.60%
Columbia High Yield Municipal Fund - Class C | Municipal Bond [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 97.70%
Columbia High Yield Municipal Fund - Class C | Other [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Columbia High Yield Municipal Fund - Institutional Class | AAA Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Columbia High Yield Municipal Fund - Institutional Class | AA Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
Columbia High Yield Municipal Fund - Institutional Class | A Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
Columbia High Yield Municipal Fund - Institutional Class | BBB Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
Columbia High Yield Municipal Fund - Institutional Class | BB Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.30%
Columbia High Yield Municipal Fund - Institutional Class | B Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Columbia High Yield Municipal Fund - Institutional Class | CCC Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
Columbia High Yield Municipal Fund - Institutional Class | Not Rated [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 58.60%
Columbia High Yield Municipal Fund - Institutional Class | WISCONSIN  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
Columbia High Yield Municipal Fund - Institutional Class | COLORADO  
Holdings [Line Items]  
Percent of Net Asset Value 8.60%
Columbia High Yield Municipal Fund - Institutional Class | FLORIDA  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
Columbia High Yield Municipal Fund - Institutional Class | TEXAS  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
Columbia High Yield Municipal Fund - Institutional Class | ILLINOIS  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
Columbia High Yield Municipal Fund - Institutional Class | CALIFORNIA  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
Columbia High Yield Municipal Fund - Institutional Class | NEW YORK  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
Columbia High Yield Municipal Fund - Institutional Class | NEW HAMPSHIRE  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Columbia High Yield Municipal Fund - Institutional Class | OHIO  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Columbia High Yield Municipal Fund - Institutional Class | PUERTO RICO  
Holdings [Line Items]  
Percent of Net Asset Value 6.60%
Columbia High Yield Municipal Fund - Institutional Class | Municipal Bond [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 97.70%
Columbia High Yield Municipal Fund - Institutional Class | Other [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Columbia High Yield Municipal Fund - Institutional 2 Class | AAA Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Columbia High Yield Municipal Fund - Institutional 2 Class | AA Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
Columbia High Yield Municipal Fund - Institutional 2 Class | A Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
Columbia High Yield Municipal Fund - Institutional 2 Class | BBB Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
Columbia High Yield Municipal Fund - Institutional 2 Class | BB Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.30%
Columbia High Yield Municipal Fund - Institutional 2 Class | B Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Columbia High Yield Municipal Fund - Institutional 2 Class | CCC Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
Columbia High Yield Municipal Fund - Institutional 2 Class | Not Rated [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 58.60%
Columbia High Yield Municipal Fund - Institutional 2 Class | WISCONSIN  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
Columbia High Yield Municipal Fund - Institutional 2 Class | COLORADO  
Holdings [Line Items]  
Percent of Net Asset Value 8.60%
Columbia High Yield Municipal Fund - Institutional 2 Class | FLORIDA  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
Columbia High Yield Municipal Fund - Institutional 2 Class | TEXAS  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
Columbia High Yield Municipal Fund - Institutional 2 Class | ILLINOIS  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
Columbia High Yield Municipal Fund - Institutional 2 Class | CALIFORNIA  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
Columbia High Yield Municipal Fund - Institutional 2 Class | NEW YORK  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
Columbia High Yield Municipal Fund - Institutional 2 Class | NEW HAMPSHIRE  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Columbia High Yield Municipal Fund - Institutional 2 Class | OHIO  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Columbia High Yield Municipal Fund - Institutional 2 Class | PUERTO RICO  
Holdings [Line Items]  
Percent of Net Asset Value 6.60%
Columbia High Yield Municipal Fund - Institutional 2 Class | Municipal Bond [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 97.70%
Columbia High Yield Municipal Fund - Institutional 2 Class | Other [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Columbia High Yield Municipal Fund - Institutional 3 Class | AAA Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Columbia High Yield Municipal Fund - Institutional 3 Class | AA Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
Columbia High Yield Municipal Fund - Institutional 3 Class | A Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
Columbia High Yield Municipal Fund - Institutional 3 Class | BBB Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
Columbia High Yield Municipal Fund - Institutional 3 Class | BB Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.30%
Columbia High Yield Municipal Fund - Institutional 3 Class | B Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Columbia High Yield Municipal Fund - Institutional 3 Class | CCC Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
Columbia High Yield Municipal Fund - Institutional 3 Class | Not Rated [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 58.60%
Columbia High Yield Municipal Fund - Institutional 3 Class | WISCONSIN  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
Columbia High Yield Municipal Fund - Institutional 3 Class | COLORADO  
Holdings [Line Items]  
Percent of Net Asset Value 8.60%
Columbia High Yield Municipal Fund - Institutional 3 Class | FLORIDA  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
Columbia High Yield Municipal Fund - Institutional 3 Class | TEXAS  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
Columbia High Yield Municipal Fund - Institutional 3 Class | ILLINOIS  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
Columbia High Yield Municipal Fund - Institutional 3 Class | CALIFORNIA  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
Columbia High Yield Municipal Fund - Institutional 3 Class | NEW YORK  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
Columbia High Yield Municipal Fund - Institutional 3 Class | NEW HAMPSHIRE  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Columbia High Yield Municipal Fund - Institutional 3 Class | OHIO  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Columbia High Yield Municipal Fund - Institutional 3 Class | PUERTO RICO  
Holdings [Line Items]  
Percent of Net Asset Value 6.60%
Columbia High Yield Municipal Fund - Institutional 3 Class | Municipal Bond [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 97.70%
Columbia High Yield Municipal Fund - Institutional 3 Class | Other [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Columbia High Yield Municipal Fund - Class S | AAA Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
Columbia High Yield Municipal Fund - Class S | AA Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
Columbia High Yield Municipal Fund - Class S | A Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
Columbia High Yield Municipal Fund - Class S | BBB Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
Columbia High Yield Municipal Fund - Class S | BB Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.30%
Columbia High Yield Municipal Fund - Class S | B Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Columbia High Yield Municipal Fund - Class S | CCC Rating [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
Columbia High Yield Municipal Fund - Class S | Not Rated [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 58.60%
Columbia High Yield Municipal Fund - Class S | WISCONSIN  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
Columbia High Yield Municipal Fund - Class S | COLORADO  
Holdings [Line Items]  
Percent of Net Asset Value 8.60%
Columbia High Yield Municipal Fund - Class S | FLORIDA  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
Columbia High Yield Municipal Fund - Class S | TEXAS  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
Columbia High Yield Municipal Fund - Class S | ILLINOIS  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
Columbia High Yield Municipal Fund - Class S | CALIFORNIA  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
Columbia High Yield Municipal Fund - Class S | NEW YORK  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
Columbia High Yield Municipal Fund - Class S | NEW HAMPSHIRE  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Columbia High Yield Municipal Fund - Class S | OHIO  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
Columbia High Yield Municipal Fund - Class S | PUERTO RICO  
Holdings [Line Items]  
Percent of Net Asset Value 6.60%
Columbia High Yield Municipal Fund - Class S | Municipal Bond [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 97.70%
Columbia High Yield Municipal Fund - Class S | Other [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%