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Selected Financial Statement Data - Inventory (Details) - USD ($)
$ in Thousands
Apr. 28, 2018
Apr. 29, 2017
Selected Financial Statement Data [Abstract]    
Raw materials $ 30,570 $ 24,801
Work-in-process 8,645 7,366
Finished goods 36,120 34,319
Inventories $ 75,335 $ 66,486