Average Annual Total Returns	12 Months Ended	60 Months Ended	120 Months Ended
Average Annual Total Returns	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025
THE GABELLI ASSET FUND CLASS AAA
Prospectus [Line Items]
Average Annual Return, Percent	16.74%	8.16%	9.58%
THE GABELLI ASSET FUND CLASS AAA \| After Taxes on Distributions
Prospectus [Line Items]
Average Annual Return, Percent	13.71%	5.60%	6.98%
THE GABELLI ASSET FUND CLASS AAA \| After Taxes on Distributions and Sales
Prospectus [Line Items]
Average Annual Return, Percent	12.09%	6.12%	7.25%
THE GABELLI ASSET FUND CLASS A
Prospectus [Line Items]
Average Annual Return, Percent	10.00%	6.88%	8.93%
THE GABELLI ASSET FUND CLASS C
Prospectus [Line Items]
Average Annual Return, Percent	14.84%	7.35%	8.76%
THE GABELLI ASSET FUND CLASS I
Prospectus [Line Items]
Average Annual Return, Percent	17.00%	8.42%	9.84%
THE GABELLI ASSET FUND CLASS I \| Standard & Poor’s (“S&P”) 500 Index (reflects no deduction for fees, expenses, or taxes)
Prospectus [Line Items]
Average Annual Return, Percent	17.88%	14.42%	14.82%