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INVENTORIES (Tables)
 9 Months Ended
Apr. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of inventories, net
Inventories, net consisted of the following:
 
April 30,
2019
 
July 31,
2018
 
(In thousands)
Raw materials
$
22,262

 
$
23,208

Work-in-process
460

 
16,147

Finished goods
2,682

 
8,431

 
$
25,404

 
$
47,786