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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%