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Inventories (Details) - USD ($) $ in Thousands | Jul. 24, 2021 | Apr. 24, 2021
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Inventory Disclosure [Abstract] |  |
Raw materials | $ 141,508 | $ 112,371
Work in process | 30,720 | 24,791
Finished goods | 130,269 | 121,182
FIFO inventories | 302,497 | 258,344
Excess of FIFO over LIFO | (38,043) | (32,207)
Total inventories | $ 264,454 | $ 226,137

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