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Inventories (Details) - USD ($) $ in Thousands	Jul. 30, 2016	Apr. 30, 2016
Inventories
Raw materials	$ 89,931	$ 87,905
Work in process	10,487	11,591
Finished goods	97,540	97,861
FIFO inventories	197,958	197,357
Excess of FIFO over LIFO	(21,768)	(21,768)
Inventories, net	$ 176,190	$ 175,589

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount of difference between inventory at lower of LIFO cost or market and inventory at lower of other inventory accounting method cost or market, for example, but not limited to, FIFO or average cost.

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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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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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