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Inventories, net (Details) - USD ($)
$ in Thousands
Oct. 29, 2016
Apr. 30, 2016
Inventories, net    
Raw materials $ 12,136 $ 11,609
Work in process 15,993 4,259
Finished goods 30,961 26,073
Inventories, gross 59,090 41,941
Reserve for inventory excess and obsolescence (3,922) (4,455)
Inventories, net $ 55,168 $ 37,486