SEGMENT INFORMATION - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2019 USD ($)	Apr. 30, 2018 USD ($)	Apr. 30, 2019 USD ($) segment	Apr. 30, 2018 USD ($)	Aug. 01, 2018 USD ($)	Jul. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment			5
Number of reportable segments | segment			5
Total assets	$ 734,750		$ 734,750		$ 829,858	$ 827,050
Net revenue	194,003	$ 193,921	615,359	$ 450,181
United States
Segment Reporting Information [Line Items]
Total assets	92,300		92,300			$ 101,800
Net revenue	133,800	129,300	416,200	216,800
China
Segment Reporting Information [Line Items]
Net revenue	32,200	24,300	106,800	87,300
Netherlands
Segment Reporting Information [Line Items]
Net revenue	$ 11,500	$ 13,300	$ 40,900	$ 45,100