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INVENTORIES - Components of Inventories (Detail) - USD ($)
$ in Thousands
Apr. 30, 2019
Aug. 01, 2018
Jul. 31, 2018
Inventory Disclosure [Abstract]      
Raw materials $ 22,262   $ 23,208
Work-in-process 460   16,147
Finished goods 2,682   8,431
Inventories, net $ 25,404 $ 26,553 $ 47,786