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Inventories, net (Details) - USD ($)
$ in Thousands
Jul. 29, 2017
Apr. 30, 2017
Inventories, net    
Raw materials $ 19,378 $ 18,365
Work in process 17,825 16,168
Finished goods 40,782 30,793
Inventories, gross 77,985 65,326
Reserve for inventory excess and obsolescence (5,968) (5,250)
Inventories, net $ 72,017 $ 60,076