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INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
New Accounting Pronouncement, Early Adoption [Line Items]
Federal statutory income tax rate	26.10%
Deferred tax assets, net, noncurrent		$ 3,420
Valuation allowance for deferred tax assets	$ 226,987	161,195
Valuation allowance increase	(65,800)	69,800
Cash and cash equivalents	305,975	138,359	$ 99,209	$ 67,879
Unrecognized tax benefits that would impact effective tax rate	7,400
Provisional income tax expense	93,800
Non-US
New Accounting Pronouncement, Early Adoption [Line Items]
Cash and cash equivalents	146,500
United States of America, Dollars | Non-US
New Accounting Pronouncement, Early Adoption [Line Items]
Cash and cash equivalents	122,600
Federal
New Accounting Pronouncement, Early Adoption [Line Items]
Net operating loss carryforwards	853,200
Federal | Research Credit Carryforwards
New Accounting Pronouncement, Early Adoption [Line Items]
Research credit carryforwards	43,300
State
New Accounting Pronouncement, Early Adoption [Line Items]
Net operating loss carryforwards	562,100
State | Research Credit Carryforwards
New Accounting Pronouncement, Early Adoption [Line Items]
Research credit carryforwards	$ 30,700
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2015-07
New Accounting Pronouncement, Early Adoption [Line Items]
Deferred tax assets, net, noncurrent		(3,300)
Deferred tax liabilities, net, current		$ (3,300)

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