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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)

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