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Convertible Senior Notes - Additional Information (Details)
$ / shares in Units, $ in Thousands, shares in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Sep. 24, 2020
USD ($)
d
$ / shares
Sep. 30, 2021
USD ($)
PurchasePeriod
$ / shares
shares
Jan. 31, 2018
USD ($)
d
PurchasePeriod
$ / shares
shares
Jul. 31, 2022
USD ($)
d
$ / shares
shares
Jul. 31, 2021
USD ($)
Oct. 31, 2021
USD ($)
Sep. 22, 2021
USD ($)
Sep. 15, 2021
USD ($)
Debt Instrument [Line Items]                  
Proceeds from Hedge, Financing Activities         $ 39,880        
Payments for unwinding of warrants         18,390        
Loss on debt extinguishment         (64,910)        
Proceeds from the issuance of convertible notes, net of issuance costs         88,687 $ 723,617      
Derivative liability         0 500,175 $ 0   $ 698,213
2023 Convertible Senior Notes                  
Debt Instrument [Line Items]                  
Payments for convertible note hedges       $ 143,200          
Loss on debt extinguishment         $ 64,900        
Number of securities called by warrants or rights (in shares) | shares       11.8          
Exercise price of warrants (in dollars per share) | $ / shares       $ 73.46 $ 73.46        
Proceeds from issuance of warrants       $ 88,000          
Transaction cost       55,200          
Share price threshold for dilutive effect of convertible debt (in dollars per share) | $ / shares         $ 10        
Dilutive effect of $10 increase in share price (in shares) | shares         0.4        
Dilutive effect of warrants (in shares) | shares         2.1        
Share price threshold for dilutive effect of warrants (in dollars per share) | $ / shares         $ 83.46        
Principal amount       $ 1,000          
2027 Convertible Senior Notes                  
Debt Instrument [Line Items]                  
Interest rate, stated percentage         0.25%        
Principal amount     $ 1,000            
Convertible Debt | 2023 Convertible Senior Notes                  
Debt Instrument [Line Items]                  
Interest rate, stated percentage       0.00% 0.00%        
Face amount       $ 575,000          
Convertible debt     416,500 $ 75,000          
Conversion ratio       20.4705          
Conversion price (in dollars per share) | $ / shares       $ 48.85          
Payments for convertible note hedges       $ 143,175          
Threshold trading days       20 20        
Threshold consecutive trading days | d       30 30        
Threshold percentage of stock price trigger       130.00% 130.00%        
Proceeds from Hedge, Financing Activities     39,900            
Payments for unwinding of warrants     18,400            
Debt outstanding               $ 145,700  
Debt repurchase amount     12,800            
Redemption price, percentage       100.00%          
Proceeds From Unwind Transactions     $ 21,500            
Unamortized discount, net       $ 10,781          
Less: other issuance costs       (707)          
Transaction costs attributable to equity component           3,000      
Debt instrument, term         5 months        
Proceeds from issuance of warrants       87,975          
Principal amount       $ 575,000 $ 145,704 575,000      
Convertible Debt | 2023 Convertible Senior Notes | Exchange Transactions                  
Debt Instrument [Line Items]                  
Face amount               416,500  
Convertible Debt | 2023 Convertible Senior Notes | Cash Transaction                  
Debt Instrument [Line Items]                  
Debt repurchase amount               12,800  
Convertible Debt | 2026 Convertible Senior Notes                  
Debt Instrument [Line Items]                  
Interest rate, stated percentage   2.50%     2.50%        
Face amount $ 750,000                
Conversion ratio   0.036036              
Conversion price (in dollars per share) | $ / shares   $ 27.75 $ 27.75            
Threshold trading days | d   20              
Threshold consecutive trading days | d   30              
Threshold percentage of stock price trigger   150.00%              
Redemption price, percentage   100.00%              
Debt instrument, term         4 years 1 month 6 days        
Proceeds from the issuance of convertible notes, net of issuance costs 723,720                
Payments of debt issuance costs $ 26,300                
Debt instrument, principal amount for conversion into common stock   $ 1,000              
Principal amount         $ 750,000 $ 750,000      
Derivative liability   $ 230,900 $ 698,200            
Convertible Debt | 2027 Convertible Senior Notes                  
Debt Instrument [Line Items]                  
Interest rate, stated percentage     0.25%   0.25%        
Face amount     $ 575,000            
Convertible debt     $ 477,300            
Conversion ratio     17.3192            
Conversion price (in dollars per share) | $ / shares     $ 57.74            
Threshold trading days | PurchasePeriod     20            
Threshold consecutive trading days | PurchasePeriod     30            
Debt Instrument Issued For Cash Net Of Expense     $ 88,400            
Debt repurchase amount     $ 14,700            
Redemption price, percentage     100.00%            
Debt Instrument Issued For Cash     $ 97,700            
Debt instrument, term         5 years 2 months 12 days        
Debt instrument, principal amount for conversion into common stock     $ 1,000            
Principal amount         $ 575,000        
Convertible Debt | 2027 Convertible Senior Notes | Exchange Transactions                  
Debt Instrument [Line Items]                  
Face amount               $ 477,300  
Minimum | Convertible Debt | 2027 Convertible Senior Notes                  
Debt Instrument [Line Items]                  
Threshold percentage of stock price trigger     130.00%            
Common Class A | Convertible Debt | 2023 Convertible Senior Notes                  
Debt Instrument [Line Items]                  
Threshold percentage of stock price trigger       98.00%          
Share price (in dollars per share) | $ / shares         $ 15.13        
Fair value of common stock (in dollars per share) | $ / shares         $ 15.13        
Principal amount       $ 1,000          
Common Class A | Convertible Debt | 2027 Convertible Senior Notes                  
Debt Instrument [Line Items]                  
Debt repurchase amount     $ 58,500            
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | shares     1.4            
Common Class A | Maximum | Convertible Debt | 2027 Convertible Senior Notes                  
Debt Instrument [Line Items]                  
Threshold percentage of stock price trigger     98.00%