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Convertible Senior Notes - Narrative (Details)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 05, 2020
USD ($)
$ / shares
Sep. 21, 2018
USD ($)
$ / shares
Jul. 31, 2020
USD ($)
trading_day
$ / shares
Jul. 31, 2019
USD ($)
Jun. 02, 2020
$ / shares
Sep. 18, 2018
$ / shares
Debt Instrument            
Proceeds from the issuance of convertible senior notes, net of issuance costs     $ 1,246,544 $ 0    
2023 Notes, Liability component            
Debt Instrument            
Effective discount rate 6.25%          
2023 Notes, Liability component | Convertible Senior Notes            
Debt Instrument            
Partial repurchase $ 407,400          
2023 Notes, Equity component | Convertible Senior Notes            
Debt Instrument            
Partial repurchase 283,600          
2023 Notes, Payment of interest accrued | Convertible Senior Notes            
Debt Instrument            
Partial repurchase 500          
2023 Notes, Partial repurchase | Convertible Senior Notes            
Debt Instrument            
Partial repurchase 691,600          
Convertible Senior Notes            
Debt Instrument            
Trading days threshold | trading_day     20      
Consecutive trading days threshold | trading_day     10      
Percentage of stock trigger price     130.00%      
Measurement period, business days | trading_day     5      
Percentage of stock trigger price for measurement period     98.00%      
Convertible senior notes repurchase price percentage     100.00%      
Convertible Senior Notes | 2027 Notes            
Debt Instrument            
Principal amount $ 1,270,000          
Stated interest rate 1.125%          
Option to purchase additional amount $ 165,000          
Proceeds from the issuance of convertible senior notes, net of issuance costs $ 1,250,000          
Conversion ratio 3.9164          
Initial conversion price (in dollars per share) | $ / shares $ 255.34   $ 255.34      
Initial conversion price premium, percent         35.00%  
Share Price | $ / shares         $ 189.14  
Effective interest rate     6.26%      
Convertible senior notes, fair value     $ 1,430,000      
Aggregate principal outstanding     1,265,000      
Convertible Senior Notes | 2027 Notes | Liability            
Debt Instrument            
Issuance costs $ 14,200          
Convertible Senior Notes | 2027 Notes | Additional paid-in capital            
Debt Instrument            
Equity component     347,400      
Issuance costs     $ 5,400      
Convertible Senior Notes | 2023 Notes            
Debt Instrument            
Principal amount   $ 1,270,000        
Stated interest rate   0.50%        
Option to purchase additional amount   $ 165,000        
Conversion ratio   6.7433        
Initial conversion price (in dollars per share) | $ / shares   $ 148.30 $ 148.30      
Initial conversion price premium, percent           27.50%
Share Price | $ / shares           $ 116.31
Effective interest rate     5.65%      
Convertible senior notes, fair value     $ 1,160,000      
Aggregate principal outstanding $ 776,700   776,661      
Convertible Senior Notes | 2023 Notes | Liability            
Debt Instrument            
Issuance costs   $ 10,400        
Convertible Senior Notes | 2023 Notes | Additional paid-in capital            
Debt Instrument            
Equity component     266,900      
Issuance costs     $ 2,800      
Convertible Senior Notes | 2025 Notes            
Debt Instrument            
Principal amount   $ 862,500        
Stated interest rate   1.125%        
Option to purchase additional amount   $ 112,500        
Conversion ratio   6.7433        
Initial conversion price (in dollars per share) | $ / shares   $ 148.30 $ 148.30      
Initial conversion price premium, percent           27.50%
Share Price | $ / shares           $ 116.31
Effective interest rate     6.22%      
Convertible senior notes, fair value     $ 1,310,000      
Aggregate principal outstanding     862,500      
Convertible Senior Notes | 2025 Notes | Liability            
Debt Instrument            
Issuance costs   $ 6,500        
Convertible Senior Notes | 2025 Notes | Additional paid-in capital            
Debt Instrument            
Equity component     237,200      
Issuance costs     $ 2,500      
Convertible Senior Notes | 2023 Notes and 2025 Notes            
Debt Instrument            
Proceeds from the issuance of convertible senior notes, net of issuance costs   $ 2,110,000        
Fiscal quarter commencing after the fiscal quarter ending on January 31, 2019 | Convertible Senior Notes            
Debt Instrument            
Trading days threshold | trading_day     20      
Consecutive trading days threshold | trading_day     30      
Percentage of stock trigger price     130.00%