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Components of Inventories (Detail) - USD ($)
$ in Thousands
Jan. 31, 2018
Jul. 31, 2017
Inventory [Line Items]    
Raw materials $ 25,055 $ 24,129
Work-in-process 15,448 713
Finished goods 4,708 9,527
Inventories, net $ 45,211 $ 34,369