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Debt - Capped Calls (Details) - Capped Calls $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2021 USD ($) $ / shares shares
Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Aggregate cost of capped calls | $	$ 67,563
Initial strike price per share (in usd per share)	$ 71.50
Initial cap price per share (in usd per share)	$ 110.00
Shares of our common stock covered by the capped calls (in shares) | shares	8,042
Convertible Senior Notes Due 2024
Debt Instrument [Line Items]
Aggregate cost of capped calls | $	$ 31,395
Initial strike price per share (in usd per share)	$ 420.24
Initial cap price per share (in usd per share)	$ 525.30
Shares of our common stock covered by the capped calls (in shares) | shares	1,642

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