XML 82 R62.htm IDEA: XBRL DOCUMENT v3.21.1
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