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Debt - Convertible Senior Notes, Notes Hedges, Warrants Narrative (Details) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2021 USD ($) $ / shares shares | Oct. 31, 2020 USD ($) | Jul. 31, 2020 USD ($) | Jan. 31, 2021 shares | Oct. 31, 2021 USD ($) trading_day $ / shares shares | Oct. 31, 2020 USD ($) | Jan. 31, 2021 shares | Feb. 01, 2021 | Sep. 30, 2017 USD ($) | Jun. 30, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Payments on convertible senior notes | $ | $ 9,000 | $ 0 |  |  | $ 80,000 | $ 249,946,000 |  |  |  |
Number of trading days related to warrants (in days) | trading_day |  |  |  |  | 60 |  |  |  |  |
2020 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Convertible senior notes, principal amount | $ |  |  |  |  |  |  |  |  |  | $ 250,000,000
Class A | 2020 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Warrants settled (shares) |  |  |  | 1,600,000 |  |  |  |  |  |
Class of warrant outstanding (in shares) | 0 |  |  |  | 0 |  |  |  |  |
Class A | 2022 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Convertible senior notes, principal amount | $ | $ 1,000 |  |  |  | $ 1,000 |  |  |  |  |
Debt instrument, convertible, number of shares |  |  |  |  | 6.7982 |  |  |  |  |
Warrants expires in 2020 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Shares covered by each purchased options or warrants (in shares) | 3,100,000 |  |  |  | 3,100,000 |  |  |  |  |
Number of trading days related to warrants (in days) | trading_day |  |  |  |  | 60 |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares | $ 107.96 |  |  |  | $ 107.96 |  |  |  |  |
Warrants expires In 2023 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Shares covered by each purchased options or warrants (in shares) | 7,800,000 |  |  |  | 7,800,000 |  |  |  |  |
Number of trading days related to warrants (in days) | trading_day |  |  |  |  | 60 |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares | $ 213.96 |  |  |  | $ 213.96 |  |  |  |  |
Convertible Debt | 2020 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Contractual interest rate |  |  |  |  |  |  |  |  |  | 1.50%
Payments on convertible senior notes | $ |  |  | $ 250,000,000 |  |  |  |  |  |  |
Convertible Debt | 2022 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Contractual interest rate |  |  |  |  |  |  |  | 0.25% | 0.25% |
Convertible senior notes, principal amount | $ |  |  |  |  |  |  |  |  | $ 1,150,000,000 |
Repurchase of notes percentage |  |  |  |  | 100.00% |  |  |  |  |
Carrying amount of the equity component | $ |  |  |  |  |  |  |  |  | $ 223,000,000 |
Effective interest rate of liability component | 0.55% |  |  |  | 0.55% |  |  |  | 4.60% |
Liability issuance costs | $ |  |  |  |  |  |  |  |  | $ 14,000,000 |
Equity issuance costs | $ |  |  |  |  |  |  |  |  | $ 4,000,000 |
Convertible Debt | Class A | 2020 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt conversion, converted instrument, shares issued |  |  |  |  |  |  | 1,700,000 |  |  |
Initial conversion price (in dollars per share) | $ / shares | $ 81.74 |  |  |  | $ 81.74 |  |  |  |  |
Indexed shares (in shares) | 3,100,000 |  |  |  | 3,100,000 |  |  |  |  |
Purchase of treasury stock from the exercise of convertible senior notes hedges (in shares) |  |  |  |  | 1,700,000 |  |  |  |  |
Convertible Debt | Class A | 2022 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares | $ 147.10 |  |  |  | $ 147.10 |  |  |  |  |
Indexed shares (in shares) | 7,800,000 |  |  |  | 7,800,000 |  |  |  |  |
Convertible Debt | Debt Conversion, Option One | Convertible Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Threshold trading days (in trading days) | trading_day |  |  |  |  | 20 |  |  |  |  |
Threshold consecutive trading days | trading_day |  |  |  |  | 30 |  |  |  |  |
Threshold percentage of conversion price |  |  |  |  | 130.00% |  |  |  |  |
Convertible Debt | Debt Conversion, Option Two | Convertible Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Threshold trading days (in trading days) | trading_day |  |  |  |  | 5 |  |  |  |  |
Threshold consecutive trading days | trading_day |  |  |  |  | 5 |  |  |  |  |
Convertible Debt | Debt Conversion, Option Two | Convertible Senior Notes | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Threshold percentage of stock trading price |  |  |  |  | 98.00% |  |  |  |  |

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