v3.25.2
Shareholder Report, Average Annual Return (Details)
 6 Months Ended 12 Months Ended 60 Months Ended 120 Months Ended
Jun. 30, 2025
Jun. 30, 2025
Jun. 30, 2025
Jun. 30, 2025
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 6.00% 10.93% 9.99% 5.81%
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 1.18% 6.28% 9.52% 5.97%
Without Sales Load [Member] | C000002889        
Average Annual Return [Line Items]        
Average Annual Return, Percent 7.33% 12.74% 10.81% 6.60%
Without Sales Load [Member] | C000002891        
Average Annual Return [Line Items]        
Average Annual Return, Percent 7.00% 11.93% 9.99% 5.81%
Without Sales Load [Member] | C000002887        
Average Annual Return [Line Items]        
Average Annual Return, Percent 7.91% 13.86% 11.95% 7.58%
Without Sales Load [Member] | C000002888        
Average Annual Return [Line Items]        
Average Annual Return, Percent 7.35% 12.76% 10.83% 6.60%
S&P 500 Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 6.20% 15.16% 16.64% 13.65%
S&P 500 Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 6.20% 15.16% 16.64% 13.65%
S&P 500 Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 6.20% 15.16% 16.64% 13.65%
S&P 500 Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 6.20% 15.16% 16.64% 13.65%
MSCI USA High Dividend Yield Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 4.89% 10.22% 11.00% 9.89%
Lipper Large Cap Value Fund Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 8.07% 14.14% 15.57% 10.42%
MSCI USA High Dividend Yield Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 4.89% 10.22% 11.00% 9.89%
Lipper Large Cap Value Fund Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 8.07% 14.14% 15.57% 10.42%
MSCI USA High Dividend Yield Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 4.89% 10.22% 11.00% 9.89%
Lipper Large Cap Value Fund Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 8.07% 14.14% 15.57% 10.42%
MSCI USA High Dividend Yield Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 4.89% 10.22% 11.00% 9.89%
Lipper Large Cap Value Fund Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 8.07% 14.14% 15.57% 10.42%