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Debt - Convertible Senior Notes, Notes Hedges, Warrants Narrative (Details)	3 Months Ended			6 Months Ended
	Jul. 31, 2021 USD ($) $ / shares shares	Apr. 30, 2021 shares	Jul. 31, 2020 USD ($)	Jul. 31, 2021 USD ($) trading_day $ / shares shares	Jan. 31, 2021 shares	Jul. 31, 2020 USD ($)	Feb. 01, 2021	Sep. 30, 2017 USD ($)	Jun. 30, 2013 USD ($)
Debt Instrument [Line Items]
Payments on convertible senior notes \| $	$ 20,000		$ 249,945,000	$ 71,000		$ 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%