SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	$ 1,804	$ 480
Provisions charged to expense	111	1,418
Accounts written off	(1,781)	(94)
Balance at end of year	$ 134	$ 1,804