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Summary of Share-Based Compensation Expense Related to Employee Stock Options, Employee Stock Purchases and Nonvested Shares (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Share-based compensation expense	$ 422	$ 998	$ 915	$ 1,880
Cost of revenue
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Share-based compensation expense	61	80	111	176
Selling, general and administrative
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Share-based compensation expense	$ 361	$ 918	$ 804	$ 1,704

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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