v3.26.1
Average Annual Total Returns
 12 Months Ended 60 Months Ended 87 Months Ended 120 Months Ended
Apr. 30, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
MSCI AC World Communication Services Index          
Prospectus [Line Items]          
Average Annual Return, Percent   32.96% 11.67%   10.79%
MSCI AC World Index          
Prospectus [Line Items]          
Average Annual Return, Percent   22.87% 11.70%   12.28%
Lipper Global Large Cap Growth Fund Classification          
Prospectus [Line Items]          
Average Annual Return, Percent   14.44% 7.28%   11.30%
MSCI EAFE Small Cap Index          
Prospectus [Line Items]          
Average Annual Return, Percent   32.49% 6.11%   7.94%
MSCI World Index          
Prospectus [Line Items]          
Average Annual Return, Percent   21.60% 12.66%   12.74%
GABELLI GLOBAL CONTENT & CONNECTIVITY FUND CLASS AAA          
Prospectus [Line Items]          
Average Annual Return, Percent   27.63% 7.57%   7.12%
GABELLI GLOBAL CONTENT & CONNECTIVITY FUND CLASS AAA | After Taxes on Distributions          
Prospectus [Line Items]          
Average Annual Return, Percent   21.09% 5.70%   5.47%
GABELLI GLOBAL CONTENT & CONNECTIVITY FUND CLASS AAA | After Taxes on Distributions and Sales          
Prospectus [Line Items]          
Average Annual Return, Percent   17.53% 5.40%   5.23%
GABELLI GLOBAL CONTENT & CONNECTIVITY FUND CLASS A          
Prospectus [Line Items]          
Average Annual Return, Percent   20.34% 6.31%   6.47%
GABELLI GLOBAL CONTENT & CONNECTIVITY FUND CLASS I          
Prospectus [Line Items]          
Average Annual Return, Percent   27.62% 7.57%   7.37%
The Gabelli Global Growth Fund CLASS AAA          
Prospectus [Line Items]          
Average Annual Return, Percent   13.94% 8.52%   12.96%
The Gabelli Global Growth Fund CLASS AAA | After Taxes on Distributions          
Prospectus [Line Items]          
Average Annual Return, Percent   10.58% 7.53%   11.66%
The Gabelli Global Growth Fund CLASS AAA | After Taxes on Distributions and Sales          
Prospectus [Line Items]          
Average Annual Return, Percent   10.54% 6.67%   10.47%
The Gabelli Global Growth Fund CLASS A          
Prospectus [Line Items]          
Average Annual Return, Percent   7.39% 7.25%   12.29%
The Gabelli Global Growth Fund CLASS I          
Prospectus [Line Items]          
Average Annual Return, Percent   13.95% 8.53%   13.19%
GABELLI INTERNATIONAL SMALL CAP FUND CLASS AAA          
Prospectus [Line Items]          
Average Annual Return, Percent   39.57% 1.59%   5.22%
GABELLI INTERNATIONAL SMALL CAP FUND CLASS AAA | After Taxes on Distributions          
Prospectus [Line Items]          
Average Annual Return, Percent   39.11% 1.40%   3.29%
GABELLI INTERNATIONAL SMALL CAP FUND CLASS AAA | After Taxes on Distributions and Sales          
Prospectus [Line Items]          
Average Annual Return, Percent   24.03% 1.31%   3.82%
GABELLI INTERNATIONAL SMALL CAP FUND CLASS A          
Prospectus [Line Items]          
Average Annual Return, Percent   31.56% 0.39%   4.37%
GABELLI INTERNATIONAL SMALL CAP FUND CLASS I          
Prospectus [Line Items]          
Average Annual Return, Percent   39.63% 1.58%   5.33%
The Gabelli Global Rising Income and Dividend Fund CLASS AAA          
Prospectus [Line Items]          
Average Annual Return, Percent   22.11% 7.00%   6.98%
The Gabelli Global Rising Income and Dividend Fund CLASS AAA | After Taxes on Distributions          
Prospectus [Line Items]          
Average Annual Return, Percent   21.43% 6.44%   6.59%
The Gabelli Global Rising Income and Dividend Fund CLASS AAA | After Taxes on Distributions and Sales          
Prospectus [Line Items]          
Average Annual Return, Percent   13.79% 5.51%   5.65%
The Gabelli Global Rising Income and Dividend Fund CLASS A          
Prospectus [Line Items]          
Average Annual Return, Percent   15.11% 5.74%   6.34%
The Gabelli Global Rising Income and Dividend Fund CLASS I          
Prospectus [Line Items]          
Average Annual Return, Percent   22.13% 7.00%   7.22%
Gabelli Global Mini Mites Fund CLASS AAA          
Prospectus [Line Items]          
Average Annual Return, Percent   10.59% 11.26% 9.26%  
Performance Inception Date Oct. 01, 2018        
Gabelli Global Mini Mites Fund CLASS AAA | After Taxes on Distributions          
Prospectus [Line Items]          
Average Annual Return, Percent   8.78% 8.44% 7.12%  
Gabelli Global Mini Mites Fund CLASS AAA | After Taxes on Distributions and Sales          
Prospectus [Line Items]          
Average Annual Return, Percent   7.32% 8.08% 6.72%  
Gabelli Global Mini Mites Fund CLASS A          
Prospectus [Line Items]          
Average Annual Return, Percent   4.24% 9.97% 8.37%  
Performance Inception Date Oct. 01, 2018        
Gabelli Global Mini Mites Fund CLASS I          
Prospectus [Line Items]          
Average Annual Return, Percent   10.59% 11.26% 9.30%  
Performance Inception Date Oct. 01, 2018        
Gabelli Global Mini Mites Fund CLASS I | S&P Developed SmallCap Index          
Prospectus [Line Items]          
Average Annual Return, Percent   18.48% 7.02% 8.75%