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Stock-Based Compensation - Summary of Stock Option Activity under Company's Share-Based Compensation Plans (Detail) - Service Based Restricted Shares and Restricted Stock Units [Member] - $ / shares
3 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Service Based Restricted Shares and Restricted Stock Units [Line Items]    
Outstanding at July 31, 2016 517,108  
Outstanding at July 31, 2016, Weighted Average Grant Date Fair Value $ 25.61  
Service-Based RSUs, Grants in Period 83,388  
Service-Based RSUs, Grants in Period, Weighted Average Grant Date Fair Value $ 36.65 $ 35.14
Service-Based RSUs, Vested in Period (130,378)  
Service-Based RSUs, Vested in Period, Weighted Average Grant Date Fair Value $ 24.67  
Service-Based RSUs, Forfeited in Period (4,412)  
Service-Based RSUs, Forfeitures, Weighted Average Grant Date Fair Value $ 26.28  
Outstanding at October 31, 2016 465,706  
Outstanding at October 31, 2016, Weighted Average Grant Date Fair Value $ 27.84