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Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Apr. 30, 2016
Jan. 31, 2016
Oct. 31, 2015
Apr. 30, 2015
Apr. 30, 2016
Apr. 30, 2015
Stock Based Compensation And Stockholders Equity [Line Items]            
Stock-based compensation expense $ 2,312     $ 1,720 $ 6,991 $ 5,047
Withholding taxes payable         $ 2,484 $ 1,562
Regular dividends declared and paid per common share $ 0.30 $ 0.30 $ 0.30 $ 0.27 $ 0.90 $ 0.81
Regular Dividends declared and paid         $ 47,227  
Restricted Stock            
Stock Based Compensation And Stockholders Equity [Line Items]            
Withholding taxes payable         $ 2,484 $ 1,562