v3.25.2
Shareholder Report, Average Annual Return (Details)
 12 Months Ended 60 Months Ended 120 Months Ended
Jul. 31, 2025
Jul. 31, 2025
Jul. 31, 2025
C000028342      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Advisor Class    
C000028338      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Class A (with sales charges)    
Average Annual Return, Percent 12.39% 12.73% 14.76%
C000028341      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Class C (with sales charges)    
Average Annual Return, Percent 15.51% 12.87% 14.40%
C000028345      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Class I    
C000159956      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Class Z    
Without Sales Load [Member] | C000028342      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.68% 14.00% 15.54%
Without Sales Load [Member] | C000028338      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.39% 13.72% 15.26%
Without Sales Load [Member] | C000028341      
Average Annual Return [Line Items]      
Average Annual Return, Percent 16.51% 12.87% 14.40%
Without Sales Load [Member] | C000028345      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.60% 13.96% 15.53%
Without Sales Load [Member] | C000159956      
Average Annual Return [Line Items]      
Average Annual Return, Percent 17.69% 14.07% 15.63%
AllianceBernstein Index: S&P 500 Index      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name S&P 500 Index    
Average Annual Return, Percent 16.33% 15.88% 13.66%
AllianceBernstein Index: S&P 500 Index      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name S&P 500 Index    
Average Annual Return, Percent 16.33% 15.88% 13.66%
AllianceBernstein Index: S&P 500 Index      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name S&P 500 Index    
Average Annual Return, Percent 16.33% 15.88% 13.66%
AllianceBernstein Index: S&P 500 Index      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name S&P 500 Index    
Average Annual Return, Percent 16.33% 15.88% 13.66%
AllianceBernstein Index: S&P 500 Index      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name S&P 500 Index    
Average Annual Return, Percent 16.33% 15.88% 13.66%
AllianceBernstein Index: Russell 1000 Growth Index      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Russell 1000 Growth Index    
Average Annual Return, Percent 23.75% 17.27% 17.06%
AllianceBernstein Index: Russell 1000 Growth Index      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Russell 1000 Growth Index    
Average Annual Return, Percent 23.75% 17.27% 17.06%
AllianceBernstein Index: Russell 1000 Growth Index      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Russell 1000 Growth Index    
Average Annual Return, Percent 23.75% 17.27% 17.06%
AllianceBernstein Index: Russell 1000 Growth Index      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Russell 1000 Growth Index    
Average Annual Return, Percent 23.75% 17.27% 17.06%
AllianceBernstein Index: Russell 1000 Growth Index      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Russell 1000 Growth Index    
Average Annual Return, Percent 23.75% 17.27% 17.06%