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Subsequent Events (Details) - USD ($)
$ in Thousands, shares in Millions
1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2021
Mar. 31, 2021
Mar. 25, 2021
Jul. 31, 2021
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2019
Subsequent Event [Line Items]              
Repayments of convertible debt         $ 384,199 $ 0 $ 0
Stock issued as repayment of convertible debt, value             $ 524,979
Convertible Debt | Convertible Senior Notes Due 2023              
Subsequent Event [Line Items]              
Debt conversion, converted instrument, amount $ 23,900       1,700,000    
Repayments of convertible debt         460,000    
Cash payments to extinguish debt         $ 459,200    
Stock issued as repayment of convertible debt (in shares)         4.7    
Stock issued as repayment of convertible debt, value         $ 1,200,000    
Subsequent Event | Convertible Debt | Convertible Senior Notes Due 2023              
Subsequent Event [Line Items]              
Debt conversion, converted instrument, amount   $ 12,800 $ 72,300 $ 6,600      
Repayments of convertible debt     23,900        
Cash payments to extinguish debt     $ 23,900        
Stock issued as repayment of convertible debt (in shares)     0.2        
Stock issued as repayment of convertible debt, value     $ 48,400