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EQUITY AWARD PLANS - Additional Information (Details) |  |  |  | 1 Months Ended | 3 Months Ended
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Aug. 01, 2020 shares | Dec. 13, 2019 USD ($) purchase_period shares | Aug. 01, 2019 shares | Feb. 29, 2020 $ / shares shares | Dec. 31, 2019 $ / shares shares | Oct. 31, 2018 $ / shares shares | Oct. 31, 2020 USD ($) plan $ / shares shares | Oct. 31, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of equity incentive plans | plan |  |  |  |  |  |  | 3 |
Granted (in shares) |  |  |  |  |  |  | 3,454,000 |
Granted (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 24.02 |
Released (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 31.23 |
Exercises in period (in shares) |  |  |  |  |  |  | 300,000 |
Weighted average exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 5.48 |
Options outstanding (in shares) |  |  |  |  |  |  | 7,200,000 |
Outstanding options, weighted average exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 5.08 |
Contractual term |  |  |  |  |  |  | 3 years 4 months 24 days |
Options outstanding, intrinsic value | $ |  |  |  |  |  |  | $ 139,600,000 |
Compensation not yet recognized | $ |  |  |  |  |  |  | $ 656,900,000 |
Period for recognition (in years) |  |  |  |  |  |  | 2 years 6 months |
Proceeds from stock plans | $ |  |  |  |  |  |  | $ 19,600,000 | $ 23,973,000
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) |  |  |  |  |  |  | 1,500,000 |
Proceeds from stock plans | $ |  |  |  |  |  |  | $ 18,100,000 |
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) |  |  |  |  |  |  | 7,700,000 |
2016 Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  |  |  |  | 49,900,000 |
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 | 10,100,000 |  | 9,400,000 |  |  |  |  |
Number of shares available for grant (in shares) |  |  |  |  |  |  | 20,200,000 |
Market Stock Units | RSUs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 75,000 | 200,000 | 100,000 |  |
Granted (in dollars per share) | $ / shares |  |  |  | $ 20.80 | $ 20.80 | $ 25.16 |  |
Released (in dollars per share) | $ / shares |  |  |  | $ 65 | $ 65 | $ 80 |  |
Award vesting period |  |  |  | 3 years 10 months 24 days | 4 years 6 months | 4 years 6 months |  |
Percent of awards to vest if average stock price exceeds threshold |  |  |  |  | 0.06 | 0.06 |  |
Equity instruments outstanding (in shares) |  |  |  |  |  |  | 375,000 |

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