Summary of Share-Based Compensation (Benefit) Expense Related to Employee Stock Options, Employee Stock Purchases and Non-Vested Shares (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation (benefit) expense	$ (32)	$ 442	$ 926	$ 1,297
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation (benefit) expense	21	38	77	171
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation (benefit) expense	$ (53)	$ 404	$ 849	$ 1,126