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Inventories (Details) - USD ($) $ in Thousands	Apr. 25, 2020	Apr. 27, 2019
Inventory Disclosure [Abstract]
Raw materials	$ 92,174	$ 90,359
Work in process	14,064	13,728
Finished goods	96,850	114,478
FIFO inventories	203,088	218,565
Excess of FIFO over LIFO	(21,445)	(21,666)
Total inventories	$ 181,643	$ 196,899

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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 by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.

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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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