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REVENUE, DEFERRED REVENUE AND DEFERRED COMMISSIONS - Deferred Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Movement in Deferred Revenue [Roll Forward]    
As of July 31, 2017 As Adjusted $ 369,056  
Additions 96,288  
Revenue Recognized (56,500)  
As of October 31, 2017 408,844  
Amount deferred in prior period 49,600 $ 29,600
Contracted revenue not recognized $ 442,400  
Percent expected to be recognized in next year 49.00%