BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for accounts receivable, beginning balance	$ 132	$ 410	$ 400
Charged to provision for doubtful accounts (credit)	0	(85)	119
Write-offs	0	(193)	(109)
Allowance for doubtful accounts—ending balance	$ 132	$ 132	$ 410