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Selected Financial Statement Data - Inventory (Details) (USD $) In Thousands, unless otherwise specified	Apr. 27, 2013	Apr. 28, 2012
Selected Financial Statement Data [Abstract]
Raw materials	$ 20,979	$ 24,880
Work-in-process	8,523	10,581
Finished goods	19,543	19,463
Inventories	49,045	54,924
Inventory allowance	$ 3,286	$ 2,851

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Carrying amount (lower of cost or market) as of the balance sheet date of inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer).

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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The amount of the valuation account as of the balance sheet date which reduces the carrying amount of inventory to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage. May also provide for estimated product returns or price concessions pertaining to product cost.

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