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Inventories (Details) - USD ($)
$ in Thousands
Jan. 23, 2021
Apr. 25, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 110,743 $ 92,174
Work in process 20,839 14,064
Finished goods 101,977 96,850
FIFO inventories 233,559 203,088
Excess of FIFO over LIFO (21,445) (21,445)
Total inventories $ 212,114 $ 181,643