Segment Information - Additional Information (Detail) $ in Thousands	3 Months Ended
	Oct. 31, 2018 USD ($) Segment	Oct. 31, 2017 USD ($)	Jul. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | Segment	5
Number of reportable segments | Segment	5
Total assets	$ 827,727		$ 827,050
Net revenue	215,133	$ 102,522
United States
Segment Reporting Information [Line Items]
Total assets	99,600		$ 101,800
Net revenue	146,200	15,200
China
Segment Reporting Information [Line Items]
Net revenue	36,600	34,800
Netherlands
Segment Reporting Information [Line Items]
Net revenue	14,900	15,200
Czech Republic
Segment Reporting Information [Line Items]
Net revenue	$ 1,200	$ 21,700