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CONVERTIBLE SENIOR NOTES - Additional Information (Details)
$ / shares in Units, shares in Millions
1 Months Ended 3 Months Ended
Sep. 24, 2020
USD ($)
day
$ / shares
Jan. 31, 2018
USD ($)
day
$ / shares
shares
Oct. 31, 2020
USD ($)
$ / shares
shares
Oct. 31, 2019
USD ($)
Jul. 31, 2020
USD ($)
Jul. 31, 2018
USD ($)
Debt Instrument [Line Items]            
Proceeds from the issuance of convertible notes, net of issuance costs     $ 723,757,000 $ 0    
Derivative liability $ 230,910,000   $ 295,650,000   $ 0  
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        
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      
Common Class A | 2023 Convertible Senior Notes            
Debt Instrument [Line Items]            
Share price (in dollars per share) | $ / shares     $ 24.34      
Convertible Debt | 2023 Convertible Senior Notes            
Debt Instrument [Line Items]            
Interest rate, stated percentage   0.00%        
Face amount   $ 575,000,000.0        
Convertible debt           $ 75,000,000.0
Conversion ratio   0.0204705        
Conversion price (in dollars per share) | $ / shares   $ 48.85        
Threshold trading days | day   20        
Threshold consecutive trading days | day   30        
Threshold percentage of stock price trigger   130.00% 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     26 months      
Payments for convertible note hedges   143,175,000        
Proceeds from issuance of warrants   $ 87,975,000        
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 | day 20          
Threshold consecutive trading days | day 30          
Threshold percentage of stock price trigger 150.00%          
Redemption price, percentage 100.00%          
Debt instrument, term     5 years 10 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          
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          
Convertible Debt | Common Class A | 2023 Convertible Senior Notes            
Debt Instrument [Line Items]            
Threshold percentage of stock price trigger   98.00%