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REVENUE, DEFERRED REVENUE AND DEFERRED COMMISSIONS - ASC 606 Impact on Income Statement (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Revenues [Abstract]    
Product $ 219,052 $ 153,536
Support and other services 56,500 35,025
Total revenue 275,552 188,561 [1]
Gross profit 166,930 118,799 [1]
Operating expenses:    
Sales and marketing 145,405 128,625 [1]
Loss from operations (59,039) (114,479) [1]
Net loss $ (61,487) $ (140,302) [1]
Basic and diluted net loss per share (in dollars per share) $ (0.39) $ (1.89) [1]
Accounting Standards Update 2014-09    
Revenues [Abstract]    
Product   $ 153,536
Support and other services   35,025
Total revenue   188,561
Gross profit   118,799
Operating expenses:    
Sales and marketing   128,625
Loss from operations   (114,479)
Net loss   $ (140,302)
Basic and diluted net loss per share (in dollars per share)   $ (1.89)
Accounting Standards Update 2014-09 | Scenario, Previously Reported    
Revenues [Abstract]    
Product   $ 129,657
Support and other services   37,152
Total revenue   166,809
Gross profit   97,047
Operating expenses:    
Sales and marketing   128,775
Loss from operations   (136,381)
Net loss   $ (162,169)
Basic and diluted net loss per share (in dollars per share)   $ (2.18)
Accounting Standards Update 2014-09 | Restatement Adjustment    
Revenues [Abstract]    
Product   $ 23,879
Support and other services   (2,127)
Total revenue   21,752
Gross profit   21,752
Operating expenses:    
Sales and marketing   (150)
Loss from operations   21,902
Net loss   $ 21,867
Basic and diluted net loss per share (in dollars per share)   $ 0.29
[1] See Note 3 for a summary of adjustments related to the adoption of the new revenue recognition standard.