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Roll-forward of Restructuring Accrual (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 26, 2013	Oct. 27, 2012	Jan. 26, 2013	Jan. 28, 2012
Restructuring Cost and Reserve [Line Items]
Charges	$ 264	$ 1,988	$ 2,252	$ (271)
Payments			2,020
Accrual Balance at January 26, 2013	232		232
Workforce reduction
Restructuring Cost and Reserve [Line Items]
Charges	264	1,577
Payments			1,679
Accrual Balance at January 26, 2013	162		162
Contract termination costs
Restructuring Cost and Reserve [Line Items]
Charges		411
Payments			341
Accrual Balance at January 26, 2013	$ 70		$ 70

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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- Definition

Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring cost.

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