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REVENUE, DEFERRED REVENUE AND DEFERRED COMMISSIONS - Deferred Revenue/Commissions (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jan. 31, 2020
Oct. 31, 2019
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Movement in Deferred Revenue [Roll Forward]          
Deferred revenue, beginning balance $ 975,274 $ 910,044   $ 910,044  
Additions 214,530 187,554      
Revenue recognized (133,220) (122,324)      
Deferred revenue, ending balance 1,056,584 975,274   1,056,584  
Movement in Deferred Commissions [Roll Forward]          
Deferred commissions, beginning balance 172,025 153,712   153,712  
Additions 62,790 57,846      
Commissions recognized (45,681) (39,533)      
Deferred commissions, ending balance 189,134 $ 172,025   189,134  
Revenue recognized, amount deferred in prior period 119,300   $ 85,700 207,500 $ 151,600
Contracted revenue not recognized $ 1,077,900     $ 1,077,900  
Percent expected to be recognized in next year 45.00%     45.00%