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
C000088645        
Average Annual Return [Line Items]        
Line Graph and Table Measure Name The Gabelli Value 25 Fund Inc. - Class AAA      
C000002904        
Average Annual Return [Line Items]        
Line Graph and Table Measure Name The Gabelli Value 25 Fund Inc. - Class C      
Average Annual Return, Percent 11.23% 20.75% 10.01% 4.84%
C000034316        
Average Annual Return [Line Items]        
Line Graph and Table Measure Name The Gabelli Value 25 Fund Inc. - Class I      
C000002902        
Average Annual Return [Line Items]        
Line Graph and Table Measure Name The Gabelli Value 25 Fund Inc. - Class A      
Average Annual Return, Percent 6.14% 15.53% 9.47% 4.98%
Without Sales Load [Member] | C000088645        
Average Annual Return [Line Items]        
Average Annual Return, Percent 12.58% 22.52% 10.79% 5.61%
Without Sales Load [Member] | C000002904        
Average Annual Return [Line Items]        
Average Annual Return, Percent 12.23% 21.75% 10.01% 4.84%
Without Sales Load [Member] | C000034316        
Average Annual Return [Line Items]        
Average Annual Return, Percent 12.91% 23.13% 11.31% 6.06%
Without Sales Load [Member] | C000002902        
Average Annual Return [Line Items]        
Average Annual Return, Percent 12.61% 22.57% 10.78% 5.61%
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%
Russell 1000 Value Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 6.00% 13.70% 13.93% 9.19%
Russell 1000 Value Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 6.00% 13.70% 13.93% 9.19%
Russell 1000 Value Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 6.00% 13.70% 13.93% 9.19%
Russell 1000 Value Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 6.00% 13.70% 13.93% 9.19%