v3.25.2
Shareholder Report, Line Graph (Details) - USD ($)
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
C000002889                      
Account Value [Line Items]                      
Line Graph and Table Measure Name The Gabelli Dividend Growth Fund - Class AAA                    
C000002891                      
Account Value [Line Items]                      
Line Graph and Table Measure Name The Gabelli Dividend Growth Fund - Class C                    
C000002887                      
Account Value [Line Items]                      
Line Graph and Table Measure Name The Gabelli Dividend Growth Fund - Class I                    
C000002888                      
Account Value [Line Items]                      
Line Graph and Table Measure Name The Gabelli Dividend Growth Fund - Class A                    
S&P 500 Index                      
Account Value [Line Items]                      
Account Value $ 35,934 $ 31,203 $ 25,051 $ 20,947 $ 23,436 $ 16,646 $ 15,483 $ 14,022 $ 12,260 $ 10,399 $ 10,000
S&P 500 Index                      
Account Value [Line Items]                      
Account Value 35,934 31,203 25,051 20,947 23,436 16,646 15,483 14,022 12,260 10,399 10,000
S&P 500 Index                      
Account Value [Line Items]                      
Account Value 35,934 31,203 25,051 20,947 23,436 16,646 15,483 14,022 12,260 10,399 10,000
S&P 500 Index                      
Account Value [Line Items]                      
Account Value 35,934 31,203 25,051 20,947 23,436 16,646 15,483 14,022 12,260 10,399 10,000
MSCI USA High Dividend Yield Index                      
Account Value [Line Items]                      
Account Value 25,689 23,307 20,680 19,445 19,610 15,244 15,804 14,220 12,965 11,465 10,000
Lipper Large Cap Value Fund Index                      
Account Value [Line Items]                      
Account Value 26,942 23,605 19,849 17,421 18,848 13,071 13,885 12,933 11,838 10,034 10,000
MSCI USA High Dividend Yield Index                      
Account Value [Line Items]                      
Account Value 25,689 23,307 20,680 19,445 19,610 15,244 15,804 14,220 12,965 11,465 10,000
Lipper Large Cap Value Fund Index                      
Account Value [Line Items]                      
Account Value 26,942 23,605 19,849 17,421 18,848 13,071 13,885 12,933 11,838 10,034 10,000
MSCI USA High Dividend Yield Index                      
Account Value [Line Items]                      
Account Value 25,689 23,307 20,680 19,445 19,610 15,244 15,804 14,220 12,965 11,465 10,000
Lipper Large Cap Value Fund Index                      
Account Value [Line Items]                      
Account Value 26,942 23,605 19,849 17,421 18,848 13,071 13,885 12,933 11,838 10,034 10,000
MSCI USA High Dividend Yield Index                      
Account Value [Line Items]                      
Account Value 25,689 23,307 20,680 19,445 19,610 15,244 15,804 14,220 12,965 11,465 10,000
Lipper Large Cap Value Fund Index                      
Account Value [Line Items]                      
Account Value $ 26,942 $ 23,605 $ 19,849 $ 17,421 $ 18,848 $ 13,071 $ 13,885 $ 12,933 $ 11,838 $ 10,034 $ 10,000