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Convertible Senior Notes - Capped Call (Details) - Senior Notes - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended
	Aug. 31, 2020	Apr. 30, 2019	Apr. 30, 2018	Mar. 31, 2021
0% Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Proceeds from issuance of convertible senior notes, net of issuance costs	$ 984,096
Conversion price				$ 107.55
0.125% Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Proceeds from issuance of convertible senior notes, net of issuance costs		$ 780,180
Conversion price				51.56
0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Proceeds from issuance of convertible senior notes, net of issuance costs			$ 335,618
Conversion price				$ 26.95
Capped Call | 0% Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Proceeds from issuance of convertible senior notes, net of issuance costs	$ 103,400
Debt instrument, convertible (in shares)				9,297,800
Conversion price				$ 156.44
Capped Call | 0.125% Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Proceeds from issuance of convertible senior notes, net of issuance costs		$ 97,200
Debt instrument, convertible (in shares)				13,576,823
Conversion price				$ 79.32
Capped Call | 0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Proceeds from issuance of convertible senior notes, net of issuance costs			$ 39,200
Debt instrument, convertible (in shares)				4,201,633
Conversion price				$ 40.68

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