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Inventories (Detail) - USD ($) $ in Thousands	Oct. 29, 2017	Apr. 30, 2017		Oct. 30, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 6,617	$ 6,456		$ 6,128
Work-in-process	2,686	3,095		2,518
Finished goods	40,906	41,931		37,308
Inventories	$ 50,209	$ 51,482	[1]	$ 45,954
[1] Derived from audited financial statements.

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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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-Section S99
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-Subparagraph (SX 210.5-02(6)(a)(1))
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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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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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