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Inventories (Details) - USD ($)
$ in Thousands
Oct. 28, 2017
Apr. 29, 2017
Inventories    
Raw materials $ 78,370 $ 83,371
Work in process 12,003 11,320
Finished goods 110,698 101,444
FIFO inventories 201,071 196,135
Excess of FIFO over LIFO (21,021) (21,021)
Total Inventories $ 180,050 $ 175,114