Components of Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2013	Jul. 31, 2013
Accrued Liabilities [Line Items]
Accrued compensation	$ 7,907	$ 7,538
Accrued vendor liability	1,907	2,153
Accrued professional fees	1,068	2,043
Warranty reserve	1,295	1,217
Accrued income, and other taxes	1,138	1,115
Accrued restructuring	960	1,037
Other accrued expenses	4,732	4,249
Total accrued expenses	$ 19,007	$ 19,352