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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)

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