Shareholder Report, Average Annual Return (Details) |
12 Months Ended | 60 Months Ended | 120 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|
May 31, 2025 |
May 31, 2025 |
May 31, 2025 |
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| Columbia High Yield Municipal Fund - Class A | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | Class A (including sales charges) | ||||||||
| Average Annual Return, Percent | [1] | 0.34% | 1.11% | 2.00% | |||||
| Columbia High Yield Municipal Fund - Class C | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | Class C (including sales charges) | ||||||||
| Average Annual Return, Percent | [1] | 1.88% | 1.12% | 1.67% | |||||
| Columbia High Yield Municipal Fund - Institutional Class | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | Institutional Class | ||||||||
| Average Annual Return, Percent | [1] | 3.69% | 1.93% | 2.51% | |||||
| Columbia High Yield Municipal Fund - Institutional 2 Class | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | Institutional 2 Class | ||||||||
| Average Annual Return, Percent | [1] | 3.60% | 1.96% | 2.55% | |||||
| Columbia High Yield Municipal Fund - Institutional 3 Class | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | Institutional 3 Class | ||||||||
| Average Annual Return, Percent | [1],[2] | 3.65% | 2.02% | 2.58% | |||||
| Columbia High Yield Municipal Fund - Class S | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | Class S | ||||||||
| Average Annual Return, Percent | [1],[3] | 3.68% | 1.93% | 2.51% | |||||
| Without Sales Load [Member] | Columbia High Yield Municipal Fund - Class A | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | Class A (excluding sales charges) | ||||||||
| Average Annual Return, Percent | [1] | 3.49% | 1.73% | 2.31% | |||||
| Without Sales Load [Member] | Columbia High Yield Municipal Fund - Class C | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | Class C (excluding sales charges) | ||||||||
| Average Annual Return, Percent | [1] | 2.87% | 1.12% | 1.67% | |||||
| Bloomberg Municipal Bond Index [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||
| Average Annual Return, Percent | 2.03% | 0.55% | 2.13% | ||||||
| Blended Benchmark [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | Blended Benchmark - 80% Bloomberg High Yield Municipal Bond Index, 20% Bloomberg Municipal Bond Index | ||||||||
| Average Annual Return, Percent | 3.32% | 3.17% | 3.63% | ||||||
| Bloomberg High Yield Municipal Bond Index [Member] | |||||||||
| Average Annual Return [Line Items] | |||||||||
| Line Graph and Table Measure Name | Bloomberg High Yield Municipal Bond Index | ||||||||
| Average Annual Return, Percent | 3.64% | 3.83% | 4.00% | ||||||
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