v3.25.4
Average Annual Total Returns
 12 Months Ended 43 Months Ended 60 Months Ended 90 Months Ended 109 Months Ended
Jan. 28, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Gabelli Media Mogul Fund Class A | S And P 500 Index Reflects No Deduction For Fees Expenses Or Taxes [Member]            
Prospectus [Line Items]            
Average Annual Return, Percent [1]   17.88% 15.29% 14.42%    
Gabelli Media Mogul Fund Class I            
Prospectus [Line Items]            
Average Annual Return, Percent   22.51%   (0.27%)   1.87%
Performance Inception Date Dec. 01, 2016          
Gabelli Media Mogul Fund Class I | After Taxes on Distributions            
Prospectus [Line Items]            
Average Annual Return, Percent   22.35%   (0.03%)   1.69%
Performance Inception Date Dec. 01, 2016          
Gabelli Media Mogul Fund Class I | After Taxes on Distributions and Sales            
Prospectus [Line Items]            
Average Annual Return, Percent   13.42%   0.18%   1.44%
Performance Inception Date Dec. 01, 2016          
Gabelli Pet Parents'(TM) Fund Class A            
Prospectus [Line Items]            
Average Annual Return, Percent   (8.64%) 5.09% (1.22%)    
Performance Inception Date [2] May 17, 2022          
Gabelli Pet Parents'(TM) Fund Class A | S And P 500 Index Reflects No Deduction For Fees Expenses Or Taxes [Member]            
Prospectus [Line Items]            
Average Annual Return, Percent [3]   17.88% 14.65% 14.42%    
Performance Inception Date [2] May 17, 2022          
Gabelli Pet Parents'(TM) Fund Class I            
Prospectus [Line Items]            
Average Annual Return, Percent   (2.88%)   0.14% 6.05%  
Performance Inception Date Jun. 19, 2018          
Gabelli Pet Parents'(TM) Fund Class I | After Taxes on Distributions            
Prospectus [Line Items]            
Average Annual Return, Percent   (2.97%)   (0.42%) 5.64%  
Performance Inception Date Jun. 19, 2018          
Gabelli Pet Parents'(TM) Fund Class I | After Taxes on Distributions and Sales            
Prospectus [Line Items]            
Average Annual Return, Percent   (1.64%)   0.05% 4.76%  
Performance Inception Date Jun. 19, 2018          
[1] The S&P 500 Index is a widely recognized, unmanaged index of common stock prices. Investors cannot invest directly in the S&P 500 Index.
[2] The Class I Share NAVs are used to calculate performance for the periods prior to the issuance of Class A Shares on May 17, 2022.
[3] The S&P 500 Index is a widely recognized, unmanaged index of common stock prices. Investors cannot invest directly in the S&P 500 Index.