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Inventories, net (Details) - USD ($)
$ in Thousands
Oct. 28, 2017
Apr. 30, 2017
Inventories, net    
Raw materials $ 21,423 $ 18,365
Work in process 22,921 16,168
Finished goods 37,164 30,793
Inventories, gross 81,508 65,326
Reserve for inventory excess and obsolescence (5,469) (5,250)
Inventories, net $ 76,039 $ 60,076