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
Jul. 31, 2015
Jul. 31, 2025
Jul. 31, 2016
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2019
Jul. 31, 2020
Jul. 31, 2021
Jul. 31, 2022
Jul. 31, 2023
Jul. 31, 2024
Jul. 31, 2025
Columbia Strategic Municipal Income Fund - Class A                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Class A (including sales charges)                    
Accumulated Value $ 9,710   $ 10,531 $ 10,521 $ 10,835 $ 11,599 $ 12,092 $ 12,807 $ 11,471 $ 11,344 $ 12,153 $ 11,784
Columbia Strategic Municipal Income Fund - Class C                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Class C (including sales charges)                    
Accumulated Value 10,000   10,764 10,700 10,937 11,592 12,024 12,617 11,218 11,011 11,707 11,267
Columbia Strategic Municipal Income Fund - Institutional Class                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Institutional Class                    
Accumulated Value 10,000   10,873 10,917 11,271 12,066 12,642 13,400 12,030 11,925 12,807 12,448
Columbia Strategic Municipal Income Fund - Institutional 2 Class                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Institutional 2 Class                    
Accumulated Value 10,000   10,845 10,889 11,241 12,035 12,610 13,368 12,002 11,898 12,780 12,431
Columbia Strategic Municipal Income Fund - Institutional 3 Class                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Institutional 3 Class                    
Accumulated Value 10,000   10,845 10,874 11,203 12,029 12,580 13,365 12,000 11,903 12,790 12,448
Columbia Strategic Municipal Income Fund - Class S                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Class S                    
Accumulated Value 10,000   10,845 10,835 11,158 11,945 12,453 13,189 11,814 11,683 12,516 12,166
Bloomberg Municipal Bond Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg Municipal Bond Index                    
Accumulated Value 10,000   10,694 10,722 10,828 11,619 12,242 12,645 11,769 11,878 12,323 12,322
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   $ 11,344 $ 11,483 $ 12,266 $ 13,257 $ 13,671 $ 15,400 $ 14,143 $ 14,115 $ 15,439 $ 15,306