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Restructuring Charges - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended
	Jan. 26, 2013	Oct. 27, 2012	Jan. 26, 2013	Jan. 28, 2012	Oct. 29, 2011 Massachusetts Facility	Jan. 26, 2013 Workforce reduction	Oct. 27, 2012 Workforce reduction	Oct. 27, 2012 Contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 264,000	$ 1,988,000	$ 2,252,000	$ (271,000)		$ 264,000	$ 1,577,000	$ 411,000
Reversed balance of a reserve for the consolidation					$ 200,000

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 any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost, excluding adjustments for costs incurred during the period, costs settled during the period, and foreign currency translation adjustments.

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