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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Jul. 28, 2012	Apr. 28, 2012
Inventory Disclosure [Abstract]
Raw materials	$ 24,402	$ 24,880
Work-in-process	9,710	10,581
Finished goods	21,822	19,463
Inventories	$ 55,934	$ 54,924

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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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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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