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REVENUE, DEFERRED REVENUE AND DEFERRED COMMISSIONS - ASC 606 Adoption Impact to Cash Flows (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
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net loss	$ (87,369)	$ (85,674)	$ (62,631)	$ (61,487)	$ (66,132)	$ (96,835)	$ (76,369)	$ (140,302)	$ (297,161)	$ (379,638)	$ (108,233)
Increase (Decrease) in Deferred Charges									40,852	24,006	21,724
Accrued expenses and other liabilities									$ 34,295	5,116	(1,209)
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net loss										(379,638)	(108,233)
Increase (Decrease) in Deferred Charges										(24,006)	(21,724)
Accrued expenses and other liabilities										5,116	(1,209)
Increase (Decrease) in Deferred Revenue										144,564	134,385
Accounting Standards Update 2014-09 [Member] \| Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net loss										(458,011)	(168,499)
Increase (Decrease) in Deferred Charges										(24,495)	(19,813)
Accrued expenses and other liabilities										4,944	(1,336)
Increase (Decrease) in Deferred Revenue										223,598	192,867
Accounting Standards Update 2014-09 [Member] \| Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net loss										78,373	60,266
Increase (Decrease) in Deferred Charges										489	(1,911)
Accrued expenses and other liabilities										172	127
Increase (Decrease) in Deferred Revenue										$ (79,034)	$ (58,482)