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Convertible Senior Notes, Net - Note Hedges, Warrants and Capped Calls (Details)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jul. 31, 2022
USD ($)
$ / shares
shares
Jul. 31, 2022
USD ($)
tradingDay
$ / shares
shares
Jul. 31, 2021
shares
Debt Instrument [Line Items]      
Antidilutive securities excluded from computation of earnings per share (in shares)   29,106 27,678
2023 convertible senior notes      
Debt Instrument [Line Items]      
Number of shares available for purchase (in shares) 100 100  
Limitation on sale of common stock due to sale price threshold (in days) | tradingDay   80  
Value of shares issuable under warrants granted (in dollars per share) | $ / shares $ 68.06 $ 68.06  
Number of warrants issued subject to anti-dilution adjustments (in shares) 1,000 1,000  
2025 convertible senior notes      
Debt Instrument [Line Items]      
Initial cap price of capped calls (in dollars per share) | $ / shares   $ 255.88  
2026 convertible senior notes      
Debt Instrument [Line Items]      
Initial cap price of capped calls (in dollars per share) | $ / shares   360.14  
Senior Notes | 2023 convertible senior notes      
Debt Instrument [Line Items]      
Conversion price (in dollars per share) | $ / shares $ 48.36 $ 48.36  
Hedge exercised and net-share-settled, consideration received on transaction | $ $ 10.0 $ 12.0  
Limitation on sale of common stock due to sale price threshold (in days) | tradingDay   30  
Senior Notes | 2023 convertible senior notes | Class A Common Stock      
Debt Instrument [Line Items]      
Hedge exercised and net-share-settled, consideration received on transaction (in shares) 100 100  
Senior Notes | 2025 convertible senior notes      
Debt Instrument [Line Items]      
Conversion price (in dollars per share) | $ / shares $ 188.71 $ 188.71  
Limitation on sale of common stock due to sale price threshold (in days) | tradingDay   30  
Senior Notes | 2026 convertible senior notes      
Debt Instrument [Line Items]      
Conversion price (in dollars per share) | $ / shares $ 238.60 $ 238.60  
Limitation on sale of common stock due to sale price threshold (in days) | tradingDay   30  
Shares related to convertible senior notes | 2023 convertible senior notes      
Debt Instrument [Line Items]      
Antidilutive securities excluded from computation of earnings per share (in shares)   108 356
Shares related to convertible senior notes | 2025 convertible senior notes      
Debt Instrument [Line Items]      
Antidilutive securities excluded from computation of earnings per share (in shares)   5,617 5,617
Shares related to convertible senior notes | 2026 convertible senior notes      
Debt Instrument [Line Items]      
Antidilutive securities excluded from computation of earnings per share (in shares)   4,820 4,820