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Provision for Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Income Tax [Line Items]    
Effective income tax rate 34.70% 30.90%
Interest and penalties related to uncertain tax benefits $ 141  
Expected decrease in unrecognized tax benefits due to resolution of uncertain tax positions 3,525  
Expected decrease in interest due to resolution of uncertain tax positions $ 935