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Convertible Senior Notes, Net - Note Hedges and Warrants (Details) $ / shares in Units, shares in Thousands, $ in Thousands		1 Months Ended		3 Months Ended	12 Months Ended
	Feb. 23, 2018 day shares	Sep. 30, 2019 USD ($) shares	Feb. 28, 2018 USD ($) day $ / shares shares	Jan. 31, 2020 USD ($) day $ / shares shares	Jan. 31, 2020 USD ($) day $ / shares shares	Jan. 31, 2019 USD ($) shares		Jan. 31, 2018 USD ($) shares		Sep. 01, 2019
Debt Instrument [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares					28,292	30,881		30,516
Proceeds from Termination of Note Hedges					$ 405,851
Number of warrants issued, subject to anti-dilution adjustments (in shares) | shares	7,100
Proceeds from issuance of warrants related to 2023 convertible senior notes					0	$ 52,440	[1]	$ 0	[1]
Payments for Repurchase of Warrants					358,622	0	[1]	0	[1]
Payment for Capped Call, Convertible Debt					$ 74,094	$ 0	[1]	$ 0	[1]
Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Shares issuable under warrants granted (in shares) | shares		4,600
Number of warrants issued, subject to anti-dilution adjustments (in shares) | shares				2,500	2,500
Per share value, shares issuable under warrants granted (in dollars per share) | $ / shares			$ 68.06
Proceeds from issuance of warrants related to 2023 convertible senior notes			$ 52,400
Payments for Repurchase of Warrants		$ 358,600
Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Initial Cap Price per Share, Capped Calls | $ / shares					$ 255.88
Payment for Capped Call, Convertible Debt					$ 74,100
Senior Notes | Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Debt issuance costs, gross		$ 3,800	$ 10,000
Shares issuable under warrants granted (in shares) | shares		4,600	7,100
Proceeds from Termination of Note Hedges		$ 405,900
Conversion price (in dollars per share) | $ / shares			$ 48.36
Aggregate amount paid for cost of Note Hedge			$ 80,000
Number of warrants issued, subject to anti-dilution adjustments (in shares) | shares				2,500	2,500
Debt Instrument, interest rate, stated percentage			0.25%
Debt instrument, interest rate, effective percentage		4.00%	5.68%
Unamortized debt issuance expense				$ 7,700	$ 7,700
Debt Instrument, Convertible, Threshold Consecutive Trading Days | day	30				30
Debt Instrument, Redemption Price, Percentage	100.00%		100.00%
Percentage of closing sale price in excess of convertible notes	98.00%
Senior Notes | Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Debt issuance costs, gross				$ 19,300	$ 19,300
Conversion price (in dollars per share) | $ / shares				$ 188.71	$ 188.71
Debt Instrument, interest rate, stated percentage										0.125%
Proceeds from Issuance of Debt		$ 1,040,700
Debt instrument, interest rate, effective percentage			4.10%
Unamortized debt issuance expense				$ 15,300	$ 15,300
Debt Instrument, Convertible, Threshold Consecutive Trading Days | day			30	30
Debt Instrument, Redemption Price, Percentage		130.00%	100.00%
Percentage of closing sale price in excess of convertible notes				98.00%
Debt Instrument, Redemption, Sales Price as a Percentage of Conversion Price		130.00%
Additional Paid-in Capital | Senior Notes | Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Debt instrument, convertible, equity component, unamortized discount issuance costs				$ 811	811
Additional Paid-in Capital | Senior Notes | Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Debt instrument, convertible, equity component, unamortized discount issuance costs				$ 4,040	$ 4,040
Convertible Debt Securities [Member]
Debt Instrument [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares					2,494	7,134		0
Convertible Debt Securities [Member] | Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares					5,600
[1] Adjusted for adoption of ASC 842. See Note 2.

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