Restructuring (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
Apr. 27, 2012	Jul. 29, 2011
Restructuring [Abstract]
Number of management and staff positions eliminated	20	60
Restructuring liability [Roll forward]
Liability at beginning of period	$ 1,579
Severance	1,660
Payments	(1,261)
Adjustments	(190)
Liability at end of period	$ 1,788	$ 1,579

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

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- Definition

The charge against earnings in the period for known and estimated costs of termination benefits provided to current employees that are involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits.

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