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 Mortgage Opportunities Fund - Class A                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Class A (including sales charges)                    
Accumulated Value $ 9,701   $ 9,781 $ 10,711 $ 11,303 $ 12,107 $ 11,558 $ 14,249 $ 13,139 $ 11,791 $ 12,174 $ 13,731
Columbia Mortgage Opportunities Fund - Class C                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Class C (including sales charges)                    
Accumulated Value 10,000   10,007 10,877 11,393 12,112 11,475 14,042 12,839 11,448 11,731 13,117
Columbia Mortgage Opportunities Fund - Institutional Class                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Institutional Class                    
Accumulated Value 10,000   10,098 11,086 11,728 12,594 12,053 14,883 13,758 12,376 12,826 14,487
Columbia Mortgage Opportunities Fund - Institutional 2 Class                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Institutional 2 Class                    
Accumulated Value 10,000   10,109 11,095 11,743 12,617 12,093 14,939 13,815 12,433 12,875 14,550
Columbia Mortgage Opportunities Fund - Institutional 3 Class                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Institutional 3 Class                    
Accumulated Value 10,000   10,083 11,051 11,703 12,580 12,051 14,908 13,795 12,423 12,870 14,549
Columbia Mortgage Opportunities Fund - Class S                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Class S                    
Accumulated Value 10,000   10,083 11,041 11,651 12,480 11,914 14,688 13,545 12,155 12,549 14,161
Bloomberg U.S. Aggregate Bond Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg U.S. Aggregate Bond Index                    
Accumulated Value 10,000   10,299 10,462 10,423 11,090 12,134 12,085 11,091 10,854 10,995 11,596
FTSE One-Month U.S. Treasury Bill Index [Member]                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   FTSE One-Month U.S. Treasury Bill Index                    
Accumulated Value $ 10,000   $ 10,009 $ 10,045 $ 10,166 $ 10,391 $ 10,554 $ 10,562 $ 10,571 $ 10,922 $ 11,528 $ 12,092