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REVENUE, DEFERRED REVENUE AND DEFERRED COMMISSIONS - ASC 606 Impact on Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended
Oct. 31, 2017
Oct. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Net loss $ (61,487) $ (140,302) [1]
Adjustments to reconcile net loss to net cash provided by operating activities:    
Deferred commission (8,457) (4,780) [2]
Accrued expenses and other liabilities (293) 717 [2]
Deferred revenue $ 39,788 51,206 [2]
Accounting Standards Update 2014-09    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Net loss   (140,302)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Deferred commission   4,780
Accrued expenses and other liabilities   717
Deferred revenue   51,206
Accounting Standards Update 2014-09 | Scenario, Previously Reported    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Net loss   (162,169)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Deferred commission   4,630
Accrued expenses and other liabilities   682
Deferred revenue   72,958
Accounting Standards Update 2014-09 | Restatement Adjustment    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Net loss   21,867
Adjustments to reconcile net loss to net cash provided by operating activities:    
Deferred commission   150
Accrued expenses and other liabilities   35
Deferred revenue   $ (21,752)
[1] See Note 3 for a summary of adjustments related to the adoption of the new revenue recognition standard.
[2] See Note 3 for a summary of adjustments related to the adoption of the new revenue recognition standard.