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Convertible Senior Notes - Additional Information (Details)
$ / shares in Units, shares in Millions
1 Months Ended 9 Months Ended
Sep. 24, 2020
USD ($)
d
$ / shares
Jan. 31, 2018
USD ($)
d
$ / shares
shares
Apr. 30, 2021
USD ($)
$ / shares
shares
Apr. 30, 2020
USD ($)
Jul. 31, 2020
USD ($)
Debt Instrument [Line Items]          
Proceeds from the issuance of convertible notes, net of issuance costs     $ 723,617,000  
Derivative liability     $ 312,263,000   $ 230,910,000
2023 Convertible Senior Notes          
Debt Instrument [Line Items]          
Number of securities called by warrants or rights (in shares) | shares   11.8      
Payments for convertible note hedges   $ 143,200,000      
Exercise price of warrants (in dollars per share) | $ / shares   $ 73.46 $ 73.46    
Proceeds from issuance of warrants   $ 88,000,000.0      
Transaction cost   $ 55,200,000      
Dilutive effect of convertible securities (in shares) | shares     3.9    
Share price threshold for dilutive effect of convertible debt (in dollars per share) | $ / shares     $ 73.46    
Dilutive effect of $10 increase in share price (in shares) | shares     4.9    
Dilutive effect of warrants (in shares) | shares     1.4    
Share price threshold for dilutive effect of warrants (in dollars per share) | $ / shares     $ 83.46    
2023 Convertible Senior Notes | Common Class A          
Debt Instrument [Line Items]          
Share price (in dollars per share) | $ / shares     $ 27.04    
Convertible Debt | 2023 Convertible Senior Notes          
Debt Instrument [Line Items]          
Interest rate, stated percentage   0.00% 0.00%    
Face amount   $ 575,000,000.0      
Convertible debt   $ 75,000,000.0      
Conversion ratio   2,047.0500      
Conversion price (in dollars per share) | $ / shares   $ 48.85      
Threshold trading days | d   20      
Threshold consecutive trading days | d   30      
Threshold percentage of stock price trigger   130.00%      
Redemption price, percentage   100.00%      
Carrying amount of liability component   $ 423,400,000      
Carrying amount of equity component   151,600,000      
Unamortized discount and debt issuance costs, net   11,500,000      
Unamortized discount, net   10,781,000      
Less: other issuance costs   707,000      
Transaction costs attributable to liability component   8,500,000      
Transaction costs attributable to equity component   3,000,000.0 $ 3,000,000.0    
Debt instrument, term     20 months    
Payments for convertible note hedges   143,175,000      
Proceeds from issuance of warrants   $ 87,975,000      
Convertible Debt | 2023 Convertible Senior Notes | Common Class A          
Debt Instrument [Line Items]          
Threshold percentage of stock price trigger   98.00%      
Convertible Debt | 2026 Convertible Senior Notes          
Debt Instrument [Line Items]          
Interest rate, stated percentage 2.50%   2.50%    
Face amount $ 750,000,000.0        
Conversion ratio 0.036036        
Conversion price (in dollars per share) | $ / shares $ 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     5 years 4 months 24 days    
Proceeds from the issuance of convertible notes, net of issuance costs $ 723,700,000        
Payments of debt issuance costs 26,300,000        
Debt instrument, principal amount for conversion into common stock $ 1,000        
Derivative liability     $ 230,900,000    
Convertible Debt | 2026 Convertible Senior Notes | Minimum          
Debt Instrument [Line Items]          
Debt instrument, convertible, conversion price, price range | $ / shares $ 25.25        
Convertible Debt | 2026 Convertible Senior Notes | Maximum          
Debt Instrument [Line Items]          
Debt instrument, convertible, conversion price, price range | $ / shares $ 27.75