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Summary of Share Based Compensation Expense Related to Employee Stock Options, Employee Stock Purchases and Employee and Non-Employee Non-Vested and Vested Shares (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2018
Jan. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Share-based compensation expense $ 7,105 $ 189 $ 7,397 $ 381
Cost of revenue        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Share-based compensation expense 1 15 12 31
Selling, general and administrative        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Share-based compensation expense $ 7,104 $ 174 $ 7,385 $ 350