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Convertible Senior Notes, Net - Convertible Senior Notes (Details) $ / shares in Units, $ in Thousands, shares in Millions		1 Months Ended		3 Months Ended	12 Months Ended
	Feb. 23, 2018 day	Sep. 30, 2019 USD ($) shares	Feb. 28, 2018 USD ($) day $ / shares	Jan. 31, 2020 USD ($) day $ / shares	Jan. 31, 2020 USD ($) day $ / shares	Jan. 31, 2019 USD ($)	[1]	Jan. 31, 2018 USD ($)	[1]	Oct. 31, 2019 USD ($)	Sep. 01, 2019
Debt Instrument [Line Items]
Limitation on sale of common stock, sale price threshold, number of trading days | day					80
Gain (Loss) on extinguishment of debt					$ (14,572)	$ 0		$ 0
Senior Notes | Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Fixed interest rate			0.25%
Net proceeds from notes			$ 335,000
Repayments of Long-term Debt		$ 224,400
Initial conversion rate of common stock	0.0206795		20.6795
Debt issuance costs		$ 3,800	$ 10,000
Principal remains outstanding				$ 120,588	$ 120,588					$ 345,000
Conversion price (in dollars per share) | $ / shares			$ 48.36
Limitation on sale of common stock, sale price threshold, number of trading days | day	20				20
Limitation on sale of common stock, sale price threshold, trading period | day	30				30
Threshold percentage of stock price trigger	130.00%				130.00%
Number of consecutive business days	5 days
Percentage of closing sale price in excess of convertible notes	98.00%
Redemption price percentage	100.00%		100.00%
Effective interest rate		4.00%	5.68%
Issuance costs attributable to liability component				7,700	$ 7,700
Debt Instrument, Repurchase Amount		$ 604,800
Debt Instrument, Repurchase Amount, Portion Allocated to to Debt Component		197,700
Debt Instrument, Repurchase Amount. Portion Allocated to Equity Component		407,100
Aggregate principal amount		183,100
Gain (Loss) on extinguishment of debt		$ (14,600)
Senior Notes | Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Fixed interest rate											0.125%
Initial conversion rate of common stock					5.2991
Debt issuance costs				19,300	$ 19,300
Principal remains outstanding				$ 1,060,000	$ 1,060,000
Conversion price (in dollars per share) | $ / shares				$ 188.71	$ 188.71
Limitation on sale of common stock, sale price threshold, trading period | day			30	30
Percentage of closing sale price in excess of convertible notes				98.00%
Redemption price percentage		130.00%	100.00%
Effective interest rate			4.10%
Issuance costs attributable to liability component				$ 15,300	$ 15,300
Additional Paid-in Capital | Senior Notes | Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Less: issuance costs				811	811
Debt Issuance Costs, Equity Component, Gross				2,300	2,300
Additional Paid-in Capital | Senior Notes | Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Less: issuance costs				$ 4,040	$ 4,040
Class A Common Stock | Senior Notes | Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Stock issued during the period (in shares) | shares		3.0
[1] Adjusted for adoption of ASC 842. See Note 2.

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