v3.26.1
Shareholder Report, Average Annual Return (Details)
 6 Months Ended 12 Months Ended 60 Months Ended 120 Months Ended
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2026
C000002889        
Average Annual Return [Line Items]        
Line Graph and Table Measure Name The Gabelli Dividend Growth Fund - Class AAA      
C000002891        
Average Annual Return [Line Items]        
Line Graph and Table Measure Name The Gabelli Dividend Growth Fund - Class C      
Average Annual Return, Percent 5.89% 15.55% 5.95% 8.29%
C000002887        
Average Annual Return [Line Items]        
Line Graph and Table Measure Name The Gabelli Dividend Growth Fund - Class I      
C000002888        
Average Annual Return [Line Items]        
Line Graph and Table Measure Name The Gabelli Dividend Growth Fund - Class A      
Average Annual Return, Percent 1.15% 10.71% 5.50% 8.45%
Without Sales Load [Member] | C000002889        
Average Annual Return [Line Items]        
Average Annual Return, Percent 7.30% 17.45% 6.74% 9.09%
Without Sales Load [Member] | C000002891        
Average Annual Return [Line Items]        
Average Annual Return, Percent 6.89% 16.55% 5.95% 8.29%
Without Sales Load [Member] | C000002887        
Average Annual Return [Line Items]        
Average Annual Return, Percent 7.84% 18.68% 7.83% 10.18%
Without Sales Load [Member] | C000002888        
Average Annual Return [Line Items]        
Average Annual Return, Percent 7.33% 17.47% 6.76% 9.10%
S&P 500 Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 10.21% 22.32% 13.41% 15.51%
S&P 500 Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 10.21% 22.32% 13.41% 15.51%
S&P 500 Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 10.21% 22.32% 13.41% 15.51%
S&P 500 Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 10.21% 22.32% 13.41% 15.51%
MSCI USA High Dividend Yield Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 11.51% 19.03% 9.29% 10.31%
Lipper Large Cap Value Fund Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 11.23% 22.52% 11.86% 12.65%
MSCI USA High Dividend Yield Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 11.51% 19.03% 9.29% 10.31%
Lipper Large Cap Value Fund Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 11.23% 22.52% 11.86% 12.65%
MSCI USA High Dividend Yield Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 11.51% 19.03% 9.29% 10.31%
Lipper Large Cap Value Fund Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 11.23% 22.52% 11.86% 12.65%
MSCI USA High Dividend Yield Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 11.51% 19.03% 9.29% 10.31%
Lipper Large Cap Value Fund Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 11.23% 22.52% 11.86% 12.65%