v3.25.2
Shareholder Report, Line Graph (Details) - USD ($)
 12 Months Ended
Jul. 31, 2025
Jul. 31, 2024
Jul. 31, 2023
Jul. 31, 2022
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
C000028342                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Advisor Class                    
Account Value $ 42,409 $ 36,035 $ 28,895 $ 25,760 $ 30,123 $ 22,021 $ 17,081 $ 15,120 $ 12,320 $ 10,385 $ 10,000
C000028338                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Class A (with sales charges)                    
Account Value $ 39,603 33,737 27,119 24,236 28,415 20,826 16,194 14,369 11,737 9,919 9,575
C000028341                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Class C (with sales charges)                    
Account Value $ 38,380 32,942 26,677 24,024 28,376 20,951 16,415 14,676 12,078 10,282 10,000
C000028345                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Class I                    
Account Value $ 42,372 36,036 28,903 25,767 30,140 22,042 17,103 15,136 12,332 10,395 10,000
C000159956                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Class Z                    
Account Value $ 42,728 36,303 29,090 25,915 30,285 22,126 17,151 15,167 12,349 10,397 10,000
AllianceBernstein Index: S&P 500 Index                      
Account Value [Line Items]                      
Line Graph and Table Measure Name S&P 500 Index                    
Account Value $ 35,989 30,936 25,327 22,410 23,500 17,223 15,384 14,246 12,256 10,561 10,000
AllianceBernstein Index: S&P 500 Index                      
Account Value [Line Items]                      
Line Graph and Table Measure Name S&P 500 Index                    
Account Value $ 35,989 30,936 25,327 22,410 23,500 17,223 15,384 14,246 12,256 10,561 10,000
AllianceBernstein Index: S&P 500 Index                      
Account Value [Line Items]                      
Line Graph and Table Measure Name S&P 500 Index                    
Account Value $ 35,989 30,936 25,327 22,410 23,500 17,223 15,384 14,246 12,256 10,561 10,000
AllianceBernstein Index: S&P 500 Index                      
Account Value [Line Items]                      
Line Graph and Table Measure Name S&P 500 Index                    
Account Value $ 35,989 30,936 25,327 22,410 23,500 17,223 15,384 14,246 12,256 10,561 10,000
AllianceBernstein Index: S&P 500 Index                      
Account Value [Line Items]                      
Line Graph and Table Measure Name S&P 500 Index                    
Account Value $ 35,989 30,936 25,327 22,410 23,500 17,223 15,384 14,246 12,256 10,561 10,000
AllianceBernstein Index: Russell 1000 Growth Index                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Russell 1000 Growth Index                    
Account Value $ 48,297 39,029 30,747 26,210 29,760 21,774 16,770 15,132 12,318 10,435 10,000
AllianceBernstein Index: Russell 1000 Growth Index                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Russell 1000 Growth Index                    
Account Value $ 48,297 39,029 30,747 26,210 29,760 21,774 16,770 15,132 12,318 10,435 10,000
AllianceBernstein Index: Russell 1000 Growth Index                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Russell 1000 Growth Index                    
Account Value $ 48,297 39,029 30,747 26,210 29,760 21,774 16,770 15,132 12,318 10,435 10,000
AllianceBernstein Index: Russell 1000 Growth Index                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Russell 1000 Growth Index                    
Account Value $ 48,297 39,029 30,747 26,210 29,760 21,774 16,770 15,132 12,318 10,435 10,000
AllianceBernstein Index: Russell 1000 Growth Index                      
Account Value [Line Items]                      
Line Graph and Table Measure Name Russell 1000 Growth Index                    
Account Value $ 48,297 $ 39,029 $ 30,747 $ 26,210 $ 29,760 $ 21,774 $ 16,770 $ 15,132 $ 12,318 $ 10,435 $ 10,000