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Inventories, net (Details) - USD ($)
$ in Thousands
Jan. 30, 2021
Apr. 30, 2020
Inventories, net    
Raw materials $ 23,608 $ 15,988
Work in process 12,225 10,340
Finished goods 25,843 29,439
Inventories, gross 61,676 55,767
Reserve for inventory excess and obsolescence (8,572) (10,232)
Inventories, net $ 53,104 $ 45,535