SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 480	$ 616
Provisions charged to expense	1,418	211
Accounts written off	(94)	(347)
Ending balance	$ 1,804	$ 480