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Selected Financial Statement Data - Inventory (Details) - USD ($)
$ in Thousands
May 02, 2020
Apr. 27, 2019
Selected Financial Statement Data [Abstract]    
Raw materials $ 35,306 $ 30,789
Work-in-process 12,102 8,239
Finished goods 39,395 39,804
Inventories $ 86,803 $ 78,832