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Selected Financial Statement Data - Inventory (Details) - USD ($)
$ in Thousands
Apr. 27, 2019
Apr. 28, 2018
Selected Financial Statement Data [Abstract]    
Raw materials $ 30,789 $ 30,570
Work-in-process 8,239 8,645
Finished goods 39,804 36,120
Inventories $ 78,832 $ 75,335