REVENUE RECOGNITION - Summary of Changes in Deferred Revenue (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Change in Deferred Revenue
Balance at beginning of period	$ 2,945	$ 3,029
Deferral of revenue	4,417	2,669
Recognition of deferred amounts upon satisfaction of performance obligation	(1,868)	(1,705)
Balance at end of period	$ 5,494	$ 3,993