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INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Income Tax Disclosure [Abstract]
U.S. federal income tax at statutory rate									$ (75,779)	$ (127,427)	$ (36,011)
U.S. tax reform impact									93,352	0	0
Change in valuation allowance									25,274	86,941	19,268
Effect of foreign operations									26,117	16,891	15,144
Stock-based compensation									(73,631)	6,701	3,655
Warrant revaluation									0	7,185	(681)
Non-deductible expenses									2,115	1,693	802
State income taxes									(290)	206	140
Transfer pricing adjustments									4,584	11,822	0
Intangible asset migration									4,461	0	0
Other									1,244	840	0
Total	$ 4,118	$ (843)	$ 1,913	$ 2,259	$ 1,555	$ 2,639	$ 547	$ 111	$ 7,447	$ 4,852	$ 2,317

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