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REVENUE, DEFERRED REVENUE AND DEFERRED COMMISSIONS - ASC 606 Impact on Balance Sheet (Details) - USD ($)
$ in Thousands
Oct. 31, 2017
Jul. 31, 2017
Assets    
Deferred commissions—current $ 26,464 $ 23,843 [1]
Deferred commissions—non-current 55,520 49,684 [1]
Total deferred commissions 81,984 73,527
Liabilities    
Deferred revenue—current 190,592 170,123 [1]
Deferred revenue—non-current 218,252 198,933 [1]
Total deferred revenue 408,844 369,056
Accrued expenses and other current liabilities 9,431 9,707 [1]
Stockholders' equity $ 216,580 217,063 [1]
Accounting Standards Update 2014-09    
Assets    
Deferred commissions—current   23,843
Deferred commissions—non-current   49,684
Total deferred commissions   73,527
Liabilities    
Deferred revenue—current   170,123
Deferred revenue—non-current   198,933
Total deferred revenue   369,056
Accrued expenses and other current liabilities   9,707
Stockholders' equity   217,063
Accounting Standards Update 2014-09 | Scenario, Previously Reported    
Assets    
Deferred commissions—current   27,679
Deferred commissions—non-current   33,709
Total deferred commissions   61,388
Liabilities    
Deferred revenue—current   233,498
Deferred revenue—non-current   292,573
Total deferred revenue   526,071
Accrued expenses and other current liabilities   9,414
Stockholders' equity   48,202
Accounting Standards Update 2014-09 | Restatement Adjustment    
Assets    
Deferred commissions—current   (3,836)
Deferred commissions—non-current   15,975
Total deferred commissions   12,139
Liabilities    
Deferred revenue—current   (63,375)
Deferred revenue—non-current   (93,640)
Total deferred revenue   (157,015)
Accrued expenses and other current liabilities   293
Stockholders' equity   $ 168,861
[1] See Note 3 for a summary of adjustments related to the adoption of the new revenue recognition standard.