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Convertible Senior Notes - Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Sep. 21, 2018
USD ($)
$ / shares
Apr. 30, 2020
USD ($)
trading_day
Sep. 18, 2018
$ / shares
Debt Instrument      
Proceeds from the issuance of convertible senior notes, net of issuance costs $ 2,110,000    
Purchase of capped calls $ 274,300    
Minimum      
Debt Instrument      
Initial conversion price | $ / shares $ 148.30    
Maximum      
Debt Instrument      
Initial conversion price | $ / shares $ 232.62    
Convertible Senior Notes      
Debt Instrument      
Conversion ratio 6.7433    
Initial conversion price | $ / shares $ 148.30    
Initial conversion price premium, percent     27.50%
Share Price | $ / shares     $ 116.31
Trading days threshold | trading_day   20  
Consecutive trading days threshold | trading_day   30  
Percentage of stock trigger price   130.00%  
Percentage of stock trigger price for measurement period   98.00%  
Convertible senior notes repurchase price percentage   100.00%  
Convertible Senior Notes | 2023 Notes      
Debt Instrument      
Principal amount $ 1,270,000 $ 1,265,000  
Stated interest rate 0.50%    
Option to purchase additional amount $ 165,000    
Equity component   264,129  
Unamortized issuance costs   $ 7,363  
Effective interest rate   5.65%  
Convertible senior notes, fair value   $ 1,460,000  
Convertible Senior Notes | 2023 Notes | Additional paid-in capital      
Debt Instrument      
Equity component   266,900  
Unamortized issuance costs   2,800  
Convertible Senior Notes | 2023 Notes | Liability      
Debt Instrument      
Unamortized issuance costs 10,400    
Convertible Senior Notes | 2025 Notes      
Debt Instrument      
Principal amount $ 862,500 $ 862,500  
Stated interest rate 1.125%    
Option to purchase additional amount $ 112,500    
Consecutive trading days threshold   10  
Equity component   $ 234,712  
Measurement period, business days   5  
Unamortized issuance costs   $ 5,260  
Effective interest rate   6.22%  
Convertible senior notes, fair value   $ 1,020,000  
Convertible Senior Notes | 2025 Notes | Additional paid-in capital      
Debt Instrument      
Equity component   237,200  
Unamortized issuance costs   $ 2,500  
Convertible Senior Notes | 2025 Notes | Liability      
Debt Instrument      
Unamortized issuance costs $ 6,500    
Fiscal Quarter Commencing After the Fiscal Quarter Ending On January 31, 2019 | Convertible Senior Notes      
Debt Instrument      
Trading days threshold   20  
Consecutive trading days threshold   30  
Percentage of stock trigger price   130.00%