Income Taxes - Components of Provision (Benefit) for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jul. 31, 2012	Apr. 28, 2012	Jan. 28, 2012	Oct. 29, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 29, 2011	Oct. 30, 2010	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Current:
Federal									$ (30)	$ 134	$ (611)
State									4	19	14
Foreign									231	127	289
Total current provision (benefit)									205	280	(308)
Deferred:
Federal
State
Foreign									(141)	78	(58)
Total deferred provision (benefit)									(141)	78	(58)
Total tax provision (benefit)	$ (202)	$ 80	$ 89	$ 97	$ 81	$ 80	$ 103	$ 94	$ 64	$ 358	$ (366)