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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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