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Selected Financial Statement Data - Inventory (Details) - USD ($) $ in Thousands	Apr. 29, 2017	Apr. 30, 2016
Selected Financial Statement Data [Abstract]
Raw materials	$ 24,801	$ 28,184
Work-in-process	7,366	6,158
Finished goods	34,319	35,485
Inventories	66,486	69,827
Inventory allowance	$ 4,967	$ 4,975

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Selected Financial Statement Data [Abstract]

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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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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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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