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EQUITY AWARD PLANS - Additional Information (Details) |  |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
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 | Apr. 30, 2020 USD ($) plan $ / shares shares | Apr. 30, 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) |  |  |  |  |  | 1,000,000.0 |  |
Weighted average exercise price (in dollars per share) | $ / shares |  |  |  |  |  | $ 5.62 |  |
Options outstanding (in shares) |  |  |  |  |  | 7,700,000 |  |
Outstanding options, weighted average exercise price (in dollars per share) | $ / shares |  |  |  |  |  | $ 5.14 |  |
Contractual term |  |  |  |  |  | 3 years 10 months 24 days |  |
Options outstanding, intrinsic value | $ |  |  |  |  |  | $ 118,300,000 |  |
Compensation not yet recognized | $ |  |  |  |  |  | $ 793,200,000 |  |
Period for recognition (in years) |  |  |  |  |  | 2 years 7 months 6 days |  |
Proceeds from stock plans | $ |  |  |  |  |  | $ 56,515,000 | $ 67,277,000 |
RSUs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  | 12,598,000 |  |
Granted (in dollars per share) | $ / shares |  |  |  |  |  | $ 27.66 |  |
Released (in dollars per share) | $ / shares |  |  |  |  |  | $ 33.94 |  |
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) |  |  |  |  |  | 3,300,000 |  |
Proceeds from stock plans | $ |  |  |  |  |  | $ 50,600,000 |  |
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) |  |  |  |  |  | 9,200,000 |  |
2016 Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  |  |  | 45,300,000 |  |
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) |  |  |  |  |  | 12,800,000 |  |
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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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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