REVENUE RECOGNITION - Summary of Changes in Deferred Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2021	Oct. 31, 2020
Change in Deferred Revenue
Balance at beginning of period	$ 2,670	$ 2,945
Deferral of revenue	685	1,096
Recognition of deferred amounts upon satisfaction of performance obligation	(494)	(853)
Balance at end of period	$ 2,861	$ 3,188