v3.25.2
Shareholder Report, Line Graph (Details) - USD ($)
 12 Months Ended 24 Months Ended 36 Months Ended 48 Months Ended 60 Months Ended 72 Months Ended 84 Months Ended 96 Months Ended 108 Months Ended 120 Months Ended
May 31, 2015
May 31, 2025
May 31, 2016
May 31, 2017
May 31, 2018
May 31, 2019
May 31, 2020
May 31, 2021
May 31, 2022
May 31, 2023
May 31, 2024
May 31, 2025
Columbia High Yield Municipal Fund - Class A                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Class A (including sales charges)                    
Accumulated Value $ 9,701   $ 10,309 $ 10,496 $ 10,881 $ 11,580 $ 11,185 $ 12,822 $ 11,700 $ 11,081 $ 11,776 $ 12,187
Columbia High Yield Municipal Fund - Class C                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Class C (including sales charges)                    
Accumulated Value 10,000   10,558 10,680 11,001 11,631 11,161 12,718 11,535 10,859 11,471 11,801
Columbia High Yield Municipal Fund - Institutional Class                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Institutional Class                    
Accumulated Value 10,000   10,648 10,862 11,284 12,044 11,645 13,389 12,243 11,606 12,359 12,815
Columbia High Yield Municipal Fund - Institutional 2 Class                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Institutional 2 Class                    
Accumulated Value 10,000   10,667 10,881 11,307 12,074 11,679 13,434 12,287 11,649 12,421 12,868
Columbia High Yield Municipal Fund - Institutional 3 Class                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Institutional 3 Class                    
Accumulated Value 10,000   10,648 10,864 11,297 12,069 11,681 13,439 12,302 11,673 12,452 12,907
Columbia High Yield Municipal Fund - Class S                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Class S                    
Accumulated Value 10,000   10,648 10,862 11,284 12,044 11,645 13,389 12,243 11,606 12,359 12,814
Bloomberg Municipal Bond Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg Municipal Bond Index                    
Accumulated Value 10,000   10,587 10,742 10,861 11,557 12,017 12,586 11,731 11,788 12,103 12,349
Blended Benchmark [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Blended Benchmark - 80% Bloomberg High Yield Municipal Bond Index, 20% Bloomberg Municipal Bond Index                    
Accumulated Value 10,000   10,495 10,912 11,491 12,352 12,225 14,027 13,133 12,919 13,832 14,291
Bloomberg High Yield Municipal Bond Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg High Yield Municipal Bond Index                    
Accumulated Value $ 10,000   $ 10,470 $ 10,952 $ 11,650 $ 12,555 $ 12,264 $ 14,394 $ 13,491 $ 13,199 $ 14,280 $ 14,799