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CONVERTIBLE SENIOR NOTES - Additional Information (Details) $ / shares in Units, shares in Millions |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 24, 2020 USD ($) day $ / shares | Jan. 31, 2018 USD ($) day $ / shares shares | Oct. 31, 2020 USD ($) $ / shares shares | Oct. 31, 2019 USD ($) | Jul. 31, 2020 USD ($) | Jul. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from the issuance of convertible notes, net of issuance costs |  |  | $ 723,757,000 | $ 0 |  |
Derivative liability | $ 230,910,000 |  | $ 295,650,000 |  | $ 0 |
2023 Convertible Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of securities called by warrants or rights (in shares) | shares |  | 11.8 |  |  |  |
Payments for convertible note hedges |  | $ 143,200,000 |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  | $ 73.46 |  |  |  |
Proceeds from issuance of warrants |  | $ 88,000,000.0 |  |  |  |
Transaction cost |  | $ (55,200,000) |  |  |  |
Dilutive effect of convertible securities (in shares) | shares |  |  | 3.9 |  |  |
Share price threshold for dilutive effect of convertible debt (in dollars per share) | $ / shares |  |  | $ 73.46 |  |  |
Dilutive effect of $10 increase in share price (in shares) | shares |  |  | 4.9 |  |  |
Dilutive effect of warrants (in shares) | shares |  |  | 1.4 |  |  |
Share price threshold for dilutive effect of warrants (in dollars per share) | $ / shares |  |  | $ 83.46 |  |  |
Common Class A | 2023 Convertible Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  | $ 24.34 |  |  |
Convertible Debt | 2023 Convertible Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage |  | 0.00% |  |  |  |
Face amount |  | $ 575,000,000.0 |  |  |  |
Convertible debt |  |  |  |  |  | $ 75,000,000.0
Conversion ratio |  | 0.0204705 |  |  |  |
Conversion price (in dollars per share) | $ / shares |  | $ 48.85 |  |  |  |
Threshold trading days | day |  | 20 |  |  |  |
Threshold consecutive trading days | day |  | 30 |  |  |  |
Threshold percentage of stock price trigger |  | 130.00% | 130.00% |  |  |
Redemption price, percentage |  | 100.00% |  |  |  |
Carrying amount of liability component |  | $ 423,400,000 |  |  |  |
Carrying amount of equity component |  | 151,600,000 |  |  |  |
Unamortized discount and debt issuance costs, net |  | 11,500,000 |  |  |  |
Unamortized discount, net |  | 10,781,000 |  |  |  |
Less: other issuance costs |  | 707,000 |  |  |  |
Transaction costs attributable to liability component |  | 8,500,000 |  |  |  |
Transaction costs attributable to equity component |  | 3,000,000.0 | $ 3,000,000.0 |  |  |
Debt instrument, term |  |  | 26 months |  |  |
Payments for convertible note hedges |  | 143,175,000 |  |  |  |
Proceeds from issuance of warrants |  | $ 87,975,000 |  |  |  |
Convertible Debt | 2026 Convertible Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 2.50% |  | 2.50% |  |  |
Face amount | $ 750,000,000.0 |  |  |  |  |
Conversion ratio | 0.036036 |  |  |  |  |
Conversion price (in dollars per share) | $ / shares | $ 27.75 |  |  |  |  |
Threshold trading days | day | 20 |  |  |  |  |
Threshold consecutive trading days | day | 30 |  |  |  |  |
Threshold percentage of stock price trigger | 150.00% |  |  |  |  |
Redemption price, percentage | 100.00% |  |  |  |  |
Debt instrument, term |  |  | 5 years 10 months 24 days |  |  |
Proceeds from the issuance of convertible notes, net of issuance costs | $ 723,700,000 |  |  |  |  |
Payments of debt issuance costs | $ 26,300,000 |  |  |  |  |
Derivative liability |  |  | $ (230,900,000) |  |  |
Convertible Debt | 2026 Convertible Senior Notes | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, convertible, conversion price, price range | $ / shares | $ 25.25 |  |  |  |  |
Convertible Debt | 2026 Convertible Senior Notes | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, convertible, conversion price, price range | $ / shares | $ 27.75 |  |  |  |  |
Convertible Debt | Common Class A | 2023 Convertible Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Threshold percentage of stock price trigger |  | 98.00% |  |  |  |

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Data Type: | na
Balance Type: |
Period Type: |