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Convertible Senior Notes, Net - Narrative (Details)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Jan. 31, 2023
USD ($)
tradingDay
$ / shares
shares
Jan. 31, 2022
shares
Jan. 31, 2021
shares
Mar. 01, 2020
Feb. 28, 2018
Debt Instrument [Line Items]          
Antidilutive securities excluded from computation of earnings per share (in shares) 28,819 27,573 25,156    
Convertible debt securities          
Debt Instrument [Line Items]          
Antidilutive securities excluded from computation of earnings per share (in shares) 0 356 832    
2023 Notes          
Debt Instrument [Line Items]          
Number of shares available for purchase 100        
Limitation on sale of common stock, sale price threshold, number of trading days | tradingDay 80        
Per share value, shares issuable under warrants granted (in dollars per share) | $ / shares $ 68.06        
Number of warrants outstanding (in shares) 1,000        
2025 Notes          
Debt Instrument [Line Items]          
Initial cap price (in dollars per share) | $ / shares $ 255.88        
2025 Notes | Convertible debt securities          
Debt Instrument [Line Items]          
Antidilutive securities excluded from computation of earnings per share (in shares) 6,000        
2026 Notes          
Debt Instrument [Line Items]          
Redemption price percentage 130.00%        
Initial cap price (in dollars per share) | $ / shares $ 360.14        
2026 Notes | Convertible debt securities          
Debt Instrument [Line Items]          
Antidilutive securities excluded from computation of earnings per share (in shares) 5,000        
Senior Notes | 2023 Notes          
Debt Instrument [Line Items]          
Fixed interest rate         0.25%
Initial conversion rate of common stock 0.0206795        
Conversion price (in dollars per share) | $ / shares $ 48.36        
Debt conversion, original debt amount | $ $ 17        
Effective interest rate 0.85% 5.68% 5.68%    
Hedge exercised, underlying debt instrument amount | $ $ 12        
Senior Notes | 2025 Notes          
Debt Instrument [Line Items]          
Fixed interest rate       0.125%  
Initial conversion rate of common stock 0.0052991        
Conversion price (in dollars per share) | $ / shares $ 188.71        
Effective interest rate 0.43% 4.10% 4.10%    
Limit within threshold of consecutive trading days | tradingDay 20        
Limitation on sale of common stock, sale price threshold, trading period | tradingDay 30        
Sales price as a percentage of conversion price 130.00%        
Number of consecutive business days | tradingDay 5        
Percentage of closing sale price in excess of convertible notes 98.00%        
Redemption price percentage 100.00%        
Senior Notes | 2026 Notes          
Debt Instrument [Line Items]          
Fixed interest rate 0.375%        
Initial conversion rate of common stock 0.0041912        
Conversion price (in dollars per share) | $ / shares $ 238.60        
Effective interest rate 0.60% 5.75% 5.75%    
Limit within threshold of consecutive trading days | tradingDay 20        
Limitation on sale of common stock, sale price threshold, trading period | tradingDay 30        
Sales price as a percentage of conversion price 130.00%        
Number of consecutive business days | tradingDay 5        
Percentage of closing sale price in excess of convertible notes 98.00%        
Redemption price percentage 100.00%        
Class A Common Stock  | Senior Notes | 2023 Notes          
Debt Instrument [Line Items]          
Shares issued to settle debt 400        
Hedge exercised, number of shares received 100