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Selected Financial Statement Data Inventory (Details) - USD ($)
$ in Thousands
Jan. 26, 2019
Apr. 28, 2018
Selected Financial Statement Data [Abstract]    
Raw materials $ 27,028 $ 30,570
Work-in-process 10,743 8,645
Finished goods 34,416 36,120
Inventories $ 72,187 $ 75,335