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Inventories, net (Details) - USD ($)
$ in Thousands
Aug. 01, 2020
Apr. 30, 2020
Inventories, net    
Raw materials $ 15,136 $ 15,988
Work in process 12,958 10,340
Finished goods 26,640 29,439
Inventories, gross 54,734 55,767
Reserve for inventory excess and obsolescence (9,204) (10,232)
Inventories, net $ 45,530 $ 45,535