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EQUITY AWARD PLANS - Additional Information (Details) |  |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 13, 2019 USD ($) purchase_period shares | Aug. 01, 2019 shares | Dec. 31, 2019 $ / shares shares | Oct. 31, 2018 $ / shares shares | Jan. 31, 2020 USD ($) plan $ / shares shares | Jan. 31, 2019 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) |  |  |  |  | 900,000 |  |
Weighted average exercise price (in dollars per share) | $ / shares |  |  |  |  | $ 5.74 |  |
Options outstanding (in shares) |  |  |  |  | 7,900,000 |  |
Outstanding options, weighted average exercise price (in dollars per share) | $ / shares |  |  |  |  | $ 5.14 |  |
Contractual term |  |  |  |  | 4 years 2 months 12 days |  |
Options outstanding, intrinsic value | $ |  |  |  |  | $ 215,300,000 |  |
Compensation not yet recognized | $ |  |  |  |  | $ 843,400,000 |  |
Period for recognition (in years) |  |  |  |  | 2 years 8 months 12 days |  |
Proceeds from stock plans | $ |  |  |  |  | $ 26,486,000 | $ 33,364,000 |
RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 10,511,000 |  |
Granted (in dollars per share) | $ / shares |  |  |  |  | $ 29.47 |  |
Released (in dollars per share) | $ / shares |  |  |  |  | $ 33.72 |  |
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) |  |  |  |  | 1,000,000.0 |  |
Proceeds from stock plans | $ |  |  |  |  | $ 21,300,000 |  |
Common Class A | Employee Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) | 11,500,000 |  |  |  |  |  |
Number of additional shares authorized | 9,200,000 |  |  |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  |  | 11,500,000 |  |
2016 Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  |  | 47,800,000 |  |
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) |  |  |  |  | 18,000,000.0 |  |
Annual increase, percent of outstanding shares |  |  |  |  | 5.00% |  |
Number of additional shares authorized |  | 9,400,000 |  |  |  |  |
Number of shares available for grant (in shares) |  |  |  |  | 14,300,000 |  |
Market Stock Units | RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Granted (in shares) |  |  | 200,000 | 100,000 |  |  |
Granted (in dollars per share) | $ / shares |  |  | $ 20.80 | $ 25.16 |  |  |
Released (in dollars per share) | $ / shares |  |  | $ 65 | $ 80 |  |  |
Award vesting period |  |  | 4 years 6 months | 4 years 6 months |  |  |
Percent of awards to vest if average stock price exceeds threshold |  |  | 0.05555555556 | 0.05555555556 |  |  |
Equity instruments outstanding (in shares) |  |  |  |  | 300,000 |  |

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