REVENUE RECOGNITION - Summary of Changes in Deferred Revenue (Detail) - USD ($) $ in Thousands	9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Change in Deferred Revenue
Balance at beginning of period	$ 2,945	$ 3,029
Deferral of revenue	4,839	3,804
Recognition of deferred amounts upon satisfaction of performance obligation	(4,868)	(2,954)
Balance at end of period	$ 2,916	$ 3,879