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 Seligman Technology and Information Fund - Class A      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Class A (including sales charges)    
Average Annual Return, Percent 0.22% 17.67% 16.81%
 Columbia Seligman Technology and Information Fund - Class C      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Class C (including sales charges)    
Average Annual Return, Percent 4.76% 18.19% 16.63%
 Columbia Seligman Technology and Information Fund - Institutional Class      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Institutional Class    
Average Annual Return, Percent 6.60% 19.37% 17.80%
Columbia Seligman Technology and Information Fund - Institutional 2 Class [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Institutional 2 Class    
Average Annual Return, Percent 6.63% 19.41% 17.86%
Columbia Seligman Technology and Information Fund Institutional 3 Class      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Institutional 3 Class    
Average Annual Return, Percent [1] 6.68% 19.47% 17.84%
Columbia Seligman Technology and Information Fund -Class R      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Class R    
Average Annual Return, Percent 6.06% 18.78% 17.21%
Columbia Seligman Technology and Information Fund -Class S      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Class S    
Average Annual Return, Percent [2] 6.50% 19.11% 17.53%
Without Sales Load [Member] | Columbia Seligman Technology and Information Fund - Class A      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Class A (excluding sales charges)    
Average Annual Return, Percent 6.33% 19.07% 17.51%
Without Sales Load [Member] |  Columbia Seligman Technology and Information Fund - Class C      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Class C (excluding sales charges)    
Average Annual Return, Percent 5.54% 18.19% 16.63%
Russell 3000® Index [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Russell 3000® Index    
Average Annual Return, Percent 13.12% 15.34% 12.21%
S&P North American Technology Sector Index [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name S&P North American Technology Sector Index    
Average Annual Return, Percent 16.50% 18.91% 19.97%
[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.