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Convertible Senior Notes - Narrative (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Jul. 09, 2021
USD ($)
$ / shares
Jun. 21, 2021
$ / shares
Jun. 05, 2020
USD ($)
$ / shares
Sep. 21, 2018
USD ($)
$ / shares
Jan. 31, 2023
USD ($)
trading_day
Jan. 31, 2022
USD ($)
Jan. 31, 2021
USD ($)
Jun. 02, 2020
$ / shares
Sep. 18, 2018
$ / shares
Debt Instrument [Line Items]                  
Proceeds from the issuance of convertible senior notes, net of issuance costs         $ 0 $ 981,920 $ 1,246,544    
2023 Notes, Liability component                  
Debt Instrument [Line Items]                  
Effective discount rate     6.25%            
2023 Notes, Liability component | Convertible Senior Notes                  
Debt Instrument [Line Items]                  
Partial repurchase     $ 407,400            
2023 Notes, Equity component | Convertible Senior Notes                  
Debt Instrument [Line Items]                  
Partial repurchase     283,600            
2023 Notes, Payment of interest accrued | Convertible Senior Notes                  
Debt Instrument [Line Items]                  
Partial repurchase     500            
2023 Notes, Partial repurchase | Convertible Senior Notes                  
Debt Instrument [Line Items]                  
Partial repurchase     691,600            
Convertible Senior Notes                  
Debt Instrument [Line Items]                  
Consecutive trading days threshold | trading_day         10        
Measurement period, business days | trading_day         5        
Percentage of stock trigger price for measurement period         98.00%        
Convertible Senior Notes | 2026 Notes                  
Debt Instrument [Line Items]                  
Principal amount $ 1,000,000                
Stated interest rate 0.75%                
Proceeds from the issuance of convertible senior notes, net of issuance costs $ 981,700                
Conversion ratio 6.25                
Initial conversion price (in dollars per share) | $ / shares $ 160.00                
Initial conversion price premium, percent   30.00%              
Share price measurement period   10 days              
Share price (in dollars per share) | $ / shares   $ 123.08              
Trading days threshold | trading_day         20        
Consecutive trading days threshold | trading_day         30        
Percentage of stock trigger price         140.00%        
Convertible senior notes repurchase price percentage         100.00%        
Effective interest rate         8.37%        
Aggregate principal outstanding         $ 1,000,000        
Convertible Senior Notes | 2026 Notes | Level 3                  
Debt Instrument [Line Items]                  
Convertible senior notes, fair value         780,000        
Convertible Senior Notes | 2026 Notes | Liability                  
Debt Instrument [Line Items]                  
Issuance costs $ 12,900                
Convertible Senior Notes | 2026 Notes | Additional Paid-in Capital                  
Debt Instrument [Line Items]                  
Equity component         293,000        
Issuance costs         $ 5,400        
Convertible Senior Notes | 2027 Notes                  
Debt Instrument [Line Items]                  
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            
Initial conversion price premium, percent               35.00%  
Share price (in dollars per share) | $ / shares               $ 189.14  
Effective interest rate         6.26%        
Convertible senior notes, fair value         $ 1,090,000        
Aggregate principal outstanding         1,265,000        
Convertible Senior Notes | 2027 Notes | Liability                  
Debt Instrument [Line Items]                  
Issuance costs     $ 14,200            
Convertible Senior Notes | 2027 Notes | Additional Paid-in Capital                  
Debt Instrument [Line Items]                  
Equity component         347,400        
Issuance costs         $ 5,400        
Convertible Senior Notes | 2023 Notes                  
Debt Instrument [Line Items]                  
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          
Initial conversion price premium, percent                 27.50%
Share price (in dollars per share) | $ / shares                 $ 116.31
Effective interest rate         5.65%        
Convertible senior notes, fair value         $ 760,000        
Aggregate principal outstanding     776,700   776,661        
Convertible Senior Notes | 2023 Notes | Liability                  
Debt Instrument [Line Items]                  
Issuance costs       $ 10,400          
Convertible Senior Notes | 2023 Notes | Additional Paid-in Capital                  
Debt Instrument [Line Items]                  
Equity component         266,900        
Issuance costs         $ 2,800        
Convertible Senior Notes | 2023 Notes, Partial repurchase                  
Debt Instrument [Line Items]                  
Aggregate principal outstanding     488,339            
Debt Instrument, Repurchased Face Amount     (488,300)            
Convertible Senior Notes | 2025 Notes                  
Debt Instrument [Line Items]                  
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          
Initial conversion price premium, percent                 27.50%
Share price (in dollars per share) | $ / shares                 $ 116.31
Effective interest rate         6.22%        
Convertible senior notes, fair value         $ 830,000        
Aggregate principal outstanding         862,500        
Convertible Senior Notes | 2025 Notes | Liability                  
Debt Instrument [Line Items]                  
Issuance costs       $ 6,500          
Convertible Senior Notes | 2025 Notes | Additional Paid-in Capital                  
Debt Instrument [Line Items]                  
Equity component         237,200        
Issuance costs         $ 2,500        
Convertible Senior Notes | 2023 Notes and 2025 Notes                  
Debt Instrument [Line Items]                  
Proceeds from the issuance of convertible senior notes, net of issuance costs       $ 2,110,000          
Convertible Senior Notes | 2023, 2025, and 2027 Notes                  
Debt Instrument [Line Items]                  
Trading days threshold | trading_day         20        
Consecutive trading days threshold | trading_day         30        
Percentage of stock trigger price         130.00%        
Convertible senior notes repurchase price percentage         100.00%        
Convertible Senior Notes | 2023 Notes, Total prior to partial repurchase                  
Debt Instrument [Line Items]                  
Aggregate principal outstanding     $ 1,265,000            
Fiscal quarter commencing after the fiscal quarter ending on January 31, 2019 | Convertible Senior Notes | 2023, 2025, and 2027 Notes                  
Debt Instrument [Line Items]                  
Trading days threshold | trading_day         20        
Consecutive trading days threshold | trading_day         30        
Percentage of stock trigger price         130.00%