v3.25.2
Shareholder Report, Average Annual Return (Details)
 12 Months Ended 60 Months Ended 120 Months Ended
May 31, 2025
May 31, 2025
May 31, 2025
Columbia Mortgage Opportunities Fund - Class A      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Class A (including sales charges)    
Average Annual Return, Percent 9.42% 2.88% 3.22%
Columbia Mortgage Opportunities Fund - Class C      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Class C (including sales charges)    
Average Annual Return, Percent 10.82% 2.71% 2.75%
Columbia Mortgage Opportunities Fund - Institutional Class      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Institutional Class    
Average Annual Return, Percent 12.94% 3.75% 3.78%
Columbia Mortgage Opportunities Fund - Institutional 2 Class      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Institutional 2 Class    
Average Annual Return, Percent 13.01% 3.77% 3.82%
Columbia Mortgage Opportunities Fund - Institutional 3 Class      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Institutional 3 Class    
Average Annual Return, Percent [1] 13.04% 3.84% 3.82%
Columbia Mortgage Opportunities Fund - Class S      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Class S    
Average Annual Return, Percent [2] 12.84% 3.52% 3.54%
Without Sales Load [Member] | Columbia Mortgage Opportunities Fund - Class A      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Class A (excluding sales charges)    
Average Annual Return, Percent 12.79% 3.51% 3.54%
Without Sales Load [Member] | Columbia Mortgage Opportunities Fund - Class C      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Class C (excluding sales charges)    
Average Annual Return, Percent 11.82% 2.71% 2.75%
Bloomberg U.S. Aggregate Bond Index [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index    
Average Annual Return, Percent 5.46% (0.90%) 1.49%
FTSE One-Month U.S. Treasury Bill Index [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name FTSE One-Month U.S. Treasury Bill Index    
Average Annual Return, Percent 4.90% 2.76% 1.92%
[1] The returns shown for periods prior to March 1, 2017 (including Since Fund Inception returns, if shown) include the returns of Class A. These returns are adjusted to reflect any higher class-related operating expenses of the newer share classes, as applicable. Please visit columbiathreadneedleus.com/investment-products/mutual-funds/appended-performance for more information.
[2] The returns shown for periods prior to October 2, 2024 (including Since Fund Inception returns, if shown) include the returns of Class A. These returns are adjusted to reflect any higher class-related operating expenses of the newer share classes, as applicable. Please visit columbiathreadneedleus.com/investment-products/mutual-funds/appended-performance for more information.