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EQUITY AWARD PLANS - Additional Information (Details) |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 01, 2018 shares | Aug. 01, 2017 shares | Oct. 31, 2016 USD ($) purchase_period shares | Jul. 31, 2018 USD ($) $ / shares shares | Jul. 31, 2017 USD ($) $ / shares shares | Jul. 31, 2016 USD ($) | Sep. 30, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  | 47,815,755 |  |  |
Period for recognition (in years) |  |  |  | 2 years 8 months 12 days |  |  |
Vested (in shares) |  |  |  | 9,660,757 | 15,241,715 |  |
Nonvested shares (in shares) |  |  |  | 1,498,288 | 4,403,961 |  |
Grants in period, weighted average grant date fair value (in dollars per share) | $ / shares |  |  |  | $ 6.41 | $ 6.36 |  |
Exercises in period, intrinsic value | $ |  |  |  | $ 289,400,000 | $ 73,900,000 | $ 18,300,000 |
Proceeds from Stock Options Exercised | $ |  |  |  | 33,100,000 | 15,600,000 | 3,500,000 |
Options vested in period, fair value | $ |  |  |  | $ 11,500,000 | $ 16,100,000 | $ 23,900,000 |
Early exercised options (in shares) |  |  |  | 11,332,554 | 20,334,531 |  |
Issuance of common stock upon exercise of stock options (in shares) |  |  |  | 8,672,623 | 4,786,381 |  |
Dividend yield | $ |  |  |  | $ 0 |  |  |
2016 Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  | 46,133,294 |  |  |
Employee Stock Option |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period (in years) |  |  |  | 4 years |  |  |
Expiration period (in years) |  |  |  | 10 years |  |  |
Incentive Stock Option |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Exercise price, percent of estimated fair value |  |  |  | 100.00% |  |  |
Non-qualified Stock Option |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Exercise price, percent of estimated fair value |  |  |  | 100.00% |  |  |
Early Exercised Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Early exercised options (in shares) |  |  |  | 243,148 |  |  |
Number of shares authorized to be repurchased (in shares) |  |  |  | 47,691 |  |  |
RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 14,947,403 | 12,986,597 |  |
Employee Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percent of eligible compensation (up to) |  |  | 15.00% |  |  |  |
Monetary cap | $ |  |  | $ 25,000 |  |  |  |
Share cap (in shares) |  |  | 1,000 |  |  |  |
Offering period duration (in months) |  |  | 12 months |  |  |  |
Number of six-month purchase periods | purchase_period |  |  | 2 |  |  |  |
Purchase price of common stock, percent |  |  | 85.00% |  |  |  |
Issuance of common stock from ESPP purchase (in shares) |  |  |  | 2,417,850 |  |  |
Proceeds from Stock Plans | $ |  |  |  | $ 39,000,000 |  |  |
Employee Stock Options Excluding Performance Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Compensation not yet recognized | $ |  |  |  | $ 647,900,000 |  |  |
Common Class A | 2016 Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  | 22,400,000 |  |  |  |
Number of shares available for grant (in shares) |  |  |  | 11,169,061.000 |  |  |
Annual increase (in shares) |  |  |  | 18,000,000 |  |  |
Annual increase, percent of outstanding shares |  |  |  | 5.00% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | 8,642,904 | 7,731,826 |  |  |  |  |
Common Class A | Employee Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  |  |  |  | 3,800,000
Annual increase (in shares) |  |  | 3,800,000 |  |  |  |
Annual increase, percent of outstanding shares |  |  | 1.00% |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized |  | 1,546,365 |  |  |  |  |
Common Class A | Employee Stock | Subsequent Event |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | 1,728,580 |  |  |  |  |  |
Employee stock purchase plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  | 1,682,461.000 |  |  |
Principal Owner | Incentive Stock Option |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expiration period (in years) |  |  |  | 5 years |  |  |
Exercise price, percent of estimated fair value |  |  |  | 110.00% |  |  |

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