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Selected Financial Statement Data - Inventory (Details) (USD $) In Thousands, unless otherwise specified	Apr. 26, 2014	Apr. 27, 2013
Selected Financial Statement Data [Abstract]
Raw materials	$ 27,660	$ 20,979
Work-in-process	11,835	8,523
Finished goods	22,733	19,543
Inventories	62,228	49,045
Inventory allowance	$ 2,692	$ 3,286

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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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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or 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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Amount of valuation reserve for inventory.

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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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