FAIR VALUE MEASUREMENTS - Level 3 Roll Forward (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Warrant
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Contingent consideration—beginning balance	$ 9,679	$ 11,683	$ 5,507
Change in fair value	21,133	(2,004)	6,176
Reclassification of unexercised warrants to APIC upon the IPO	30,812	0	0
Convertible preferred stock warrant liability—beginning balance	0	9,679	$ 11,683
Commitments
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Contingent consideration—beginning balance	0
Change in fair value	1,924
Assumed in the PernixData acquisition	2,371
Convertible preferred stock warrant liability—beginning balance	$ 4,295	$ 0