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Activity Related to Product Warranty Liability (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 26, 2013	Jan. 28, 2012	Jan. 26, 2013	Jan. 28, 2012
Product Warranty [Line Items]
Beginning balance	$ 1,082	$ 1,136	$ 1,072	$ 1,140
Accruals /adjustments	32	52	82	121
Settlements	(39)	(63)	(79)	(136)
Ending balance	$ 1,075	$ 1,125	$ 1,075	$ 1,125

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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