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Debt - Capped Calls (Details) - Capped Calls $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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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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