REVENUE RECOGNITION - Summary of Changes in Deferred Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Change in Deferred Revenue
Balance at beginning of period	$ 2,945	$ 3,029
Deferral of revenue	1,096	1,216
Recognition of deferred amounts upon satisfaction of performance obligation	(853)	(855)
Balance at end of period	$ 3,188	$ 3,390