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Inventories (Details) - USD ($)
$ in Thousands
Apr. 28, 2018
Apr. 29, 2017
Inventories    
Raw materials $ 86,214 $ 83,371
Work in process 12,254 11,320
Finished goods 109,183 101,444
FIFO inventories 207,651 196,135
Excess of FIFO over LIFO (22,810) (21,021)
Total inventories $ 184,841 $ 175,114