Components of Other Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013	Jul. 31, 2012
Accrued Liabilities [Line Items]
Accrued compensation	$ 6,885	$ 7,059
Accrued vendor liability	2,234	2,373
Warranty reserve	1,258	1,672
Accrued restructuring	1,183	1,502
Accrued taxes	1,079	931
Accrued commissions	580	1,301
Other accrued expenses	4,163	4,898
Total accrued expenses	$ 17,382	$ 19,736