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INVENTORIES - Components of Inventories (Detail) - USD ($)
$ in Thousands
Apr. 30, 2020
Jul. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 18,060 $ 21,322
Work-in-process 309 587
Finished goods 1,153 1,765
Inventories, net $ 19,522 $ 23,674