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Inventories (Details) - USD ($)
$ in Thousands
Oct. 26, 2019
Apr. 27, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 95,842 $ 90,359
Work in process 13,913 13,728
Finished goods 117,035 114,478
FIFO inventories 226,790 218,565
Excess of FIFO over LIFO (21,666) (21,666)
Total inventories $ 205,124 $ 196,899