v3.26.1
Shareholder Report, Line Graph (Details) - USD ($)
 6 Months Ended 12 Months Ended 24 Months Ended 36 Months Ended 48 Months Ended 60 Months Ended 72 Months Ended 84 Months Ended 96 Months Ended 108 Months Ended 120 Months Ended
Jun. 30, 2016
Jun. 30, 2026
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2026
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]                        
Accumulated Value $ 10,000   $ 11,790 $ 13,484 $ 14,889 $ 16,007 $ 22,537 $ 20,143 $ 24,090 $ 30,006 $ 34,555 $ 42,268
S&P 500 Index                        
Account Value [Line Items]                        
Accumulated Value 10,000   11,790 13,484 14,889 16,007 22,537 20,143 24,090 30,006 34,555 42,268
S&P 500 Index                        
Account Value [Line Items]                        
Accumulated Value 10,000   11,790 13,484 14,889 16,007 22,537 20,143 24,090 30,006 34,555 42,268
S&P 500 Index                        
Account Value [Line Items]                        
Accumulated Value 10,000   11,790 13,484 14,889 16,007 22,537 20,143 24,090 30,006 34,555 42,268
MSCI USA High Dividend Yield Index                        
Account Value [Line Items]                        
Accumulated Value 10,000   11,308 12,403 13,784 13,296 17,104 16,961 18,038 20,328 22,406 26,670
Lipper Large Cap Value Fund Index                        
Account Value [Line Items]                        
Accumulated Value 10,000   11,798 12,889 13,838 13,027 18,784 17,362 19,782 23,525 26,851 32,898
MSCI USA High Dividend Yield Index                        
Account Value [Line Items]                        
Accumulated Value 10,000   11,308 12,403 13,784 13,296 17,104 16,961 18,038 20,328 22,406 26,670
Lipper Large Cap Value Fund Index                        
Account Value [Line Items]                        
Accumulated Value 10,000   11,798 12,889 13,838 13,027 18,784 17,362 19,782 23,525 26,851 32,898
MSCI USA High Dividend Yield Index                        
Account Value [Line Items]                        
Accumulated Value 10,000   11,308 12,403 13,784 13,296 17,104 16,961 18,038 20,328 22,406 26,670
Lipper Large Cap Value Fund Index                        
Account Value [Line Items]                        
Accumulated Value 10,000   11,798 12,889 13,838 13,027 18,784 17,362 19,782 23,525 26,851 32,898
MSCI USA High Dividend Yield Index                        
Account Value [Line Items]                        
Accumulated Value 10,000   11,308 12,403 13,784 13,296 17,104 16,961 18,038 20,328 22,406 26,670
Lipper Large Cap Value Fund Index                        
Account Value [Line Items]                        
Accumulated Value $ 10,000   $ 11,798 $ 12,889 $ 13,838 $ 13,027 $ 18,784 $ 17,362 $ 19,782 $ 23,525 $ 26,851 $ 32,898