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REVENUE, DEFERRED REVENUE AND DEFERRED COMMISSIONS - ASC 606 Adoption Impact to Income Statement (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jul. 31, 2018
Apr. 30, 2018
Jan. 31, 2018
Oct. 31, 2017
Jul. 31, 2017
Apr. 30, 2017
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total revenue $ 303,748 $ 289,413 $ 286,744 $ 275,552 $ 252,458 $ 205,670 $ 199,214 $ 188,561 $ 1,155,457 $ 845,903 $ 503,410
Gross Profit 230,483 193,798 178,216 166,930 154,941 122,464 122,368 118,799 769,427 518,572 332,623
Sales and marketing 183,191 169,860 151,201 145,405 134,276 126,746 111,374 128,625 649,657 501,021 286,584
Operating Income (Loss) (79,230) (82,282) (59,857) (59,039) (64,030) (94,499) (75,401) (114,479) (280,408) (348,409) (104,626)
Net loss $ (87,369) $ (85,674) $ (62,631) $ (61,487) $ (66,132) $ (96,835) $ (76,369) $ (140,302) $ (297,161) $ (379,638) $ (108,233)
Net income (loss) per share attributable to common stockholders—basic and diluted (in dollars per share) $ (0.51) $ (0.51) $ (0.39) $ (0.39) $ (0.43) $ (0.67) $ (0.54) $ (1.89) $ (1.81) $ (2.96) $ (2.46)
Product                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total revenue $ 224,650 $ 221,117 $ 223,170 $ 219,052 $ 201,472 $ 160,076 $ 158,213 $ 153,536 $ 887,989 $ 673,297 $ 413,910
Support, entitlements and other services                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total revenue $ 79,098 $ 68,296 $ 63,574 $ 56,500 $ 50,986 $ 45,594 $ 41,001 $ 35,025 267,468 172,606 89,500
Accounting Standards Update 2014-09 [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total revenue                 $ 1,155,457 845,903 503,410
Gross Profit                   518,572 332,623
Sales and marketing                   501,021 286,584
Operating Income (Loss)                   (348,409) (104,626)
Net loss                   $ (379,638) $ (108,233)
Net income (loss) per share attributable to common stockholders—basic and diluted (in dollars per share)                   $ (2.96) $ (2.46)
Accounting Standards Update 2014-09 [Member] | Previously Reported [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total revenue                   $ 766,869 $ 444,928
Gross Profit                   439,538 274,141
Sales and marketing                   500,529 288,493
Operating Income (Loss)                   (426,951) (165,017)
Net loss                   $ (458,011) $ (168,499)
Net income (loss) per share attributable to common stockholders—basic and diluted (in dollars per share)                   $ (3.57) $ (3.83)
Accounting Standards Update 2014-09 [Member] | Restatement Adjustment [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total revenue                   $ 79,034 $ 58,482
Gross Profit                   79,034 58,482
Sales and marketing                   492 (1,909)
Operating Income (Loss)                   78,542 60,391
Net loss                   $ 78,373 $ 60,266
Net income (loss) per share attributable to common stockholders—basic and diluted (in dollars per share)                   $ 0.61 $ 1.37
Accounting Standards Update 2014-09 [Member] | Product                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total revenue                   $ 673,297 $ 413,910
Accounting Standards Update 2014-09 [Member] | Product | Previously Reported [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total revenue                   583,011 350,798
Accounting Standards Update 2014-09 [Member] | Product | Restatement Adjustment [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total revenue                   90,286 63,112
Accounting Standards Update 2014-09 [Member] | Support, entitlements and other services                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total revenue                   172,606 89,500
Accounting Standards Update 2014-09 [Member] | Support, entitlements and other services | Previously Reported [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total revenue                   183,858 94,130
Accounting Standards Update 2014-09 [Member] | Support, entitlements and other services | Restatement Adjustment [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total revenue                   $ (11,252) $ (4,630)