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EQUITY AWARD PLANS - Additional Information (Details) |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 01, 2018 shares | Aug. 01, 2017 shares | Sep. 30, 2016 USD ($) purchase_period shares | Apr. 30, 2019 USD ($) $ / shares shares | Apr. 30, 2019 USD ($) plan $ / shares shares | Apr. 30, 2018 USD ($) | Jul. 31, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of equity incentive plans | plan |  |  |  |  | 3 |  |
Exercises in period (in shares) |  |  |  |  | 2,194,303 |  |
Weighted average exercise price (in dollars per share) | $ / shares |  |  |  |  | $ 4.64 |  |
Options outstanding (in shares) |  |  |  | 9,103,232 | 9,103,232 |  |
Outstanding options, weighted average exercise price (in dollars per share) | $ / shares |  |  |  | $ 5.22 | $ 5.22 |  |
Contractual term |  |  |  |  | 4 years 10 months 24 days |  |
Options outstanding, intrinsic value | $ |  |  |  | $ 345,700,000 | $ 345,700,000 |  |
Compensation not yet recognized | $ |  |  |  | $ 791,300,000 | $ 791,300,000 |  |
Period for recognition (in years) |  |  |  |  | 2 years 6 months |  |
Proceeds from stock plans | $ |  |  |  |  | $ 67,277,000 | $ 68,186,000 |
RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 8,445,399 |  |
Granted (in dollars per share) | $ / shares |  |  |  |  | $ 47.63 |  |
Released (in dollars per share) | $ / shares |  |  |  |  | $ 28.07 |  |
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% |  |  |  |
ESPP stock issued during period (in shares) |  |  |  | 2,008,082 |  |  |
Proceeds from stock plans | $ |  |  |  | $ 57,200,000 |  |  |
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% |  |  |  |
Number of additional shares authorized | 1,728,580 | 1,546,365 |  |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  | 1,402,959 | 1,402,959 |  |
2016 Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  | 46,199,635 | 46,199,635 |  |
2016 Plan | Common Class A |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  |  |  |  | 22,400,000
Annual increase (in shares) |  |  |  | 18,000,000 | 18,000,000 |  |
Annual increase, percent of outstanding shares |  |  |  | 5.00% | 5.00% |  |
Number of additional shares authorized | 8,642,904 | 7,731,826 |  |  |  |  |
Number of shares available for grant (in shares) |  |  |  | 13,827,893 | 13,827,893 |  |
Market Stock Units | RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 100,000 |  |
Granted (in dollars per share) | $ / shares |  |  |  |  | $ 25.16 |  |
Released (in dollars per share) | $ / shares |  |  |  |  | $ 80 |  |
Award vesting period |  |  |  |  | 4 years 6 months |  |
Equity instruments outstanding (in shares) |  |  |  | 100,000 | 100,000 |  |

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