SEGMENT INFORMATION - Additional Information (Detail) $ in Thousands	3 Months Ended
	Oct. 31, 2020 USD ($) segment	Oct. 31, 2019 USD ($)	Jul. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment	2
Number of reportable segments | segment	2
Total assets	$ 756,357		$ 759,172
Revenues	169,934	$ 225,153
United States
Segment Reporting Information [Line Items]
Revenues	121,483	153,046
China
Segment Reporting Information [Line Items]
Revenues	19,640	39,389
Netherlands
Segment Reporting Information [Line Items]
Revenues	7,795	10,648
Other
Segment Reporting Information [Line Items]
Revenues	$ 21,016	$ 22,070