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Long‑Term Debt - 2027 Convertible Senior Notes (Details)
9 Months Ended
Jun. 28, 2021
USD ($)
share_rate
day
$ / shares
Jan. 26, 2021
USD ($)
share_rate
day
$ / shares
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Debt Instrument [Line Items]        
Payments of debt issuance costs | $     $ 5,643,000 $ 432,000
2027 Notes: | Convertible Debt        
Debt Instrument [Line Items]        
Debt instrument, face amount | $ $ 575,000,000      
Debt instrument, interest rate, stated percentage 0.375%      
Payments of debt issuance costs | $ $ 15,065,000      
Payments of expenses associated with initial public offering | $ $ 25,875,000      
Debt instrument, convertible, threshold percentage of stock price trigger 130.00%      
Debt instrument, convertible, threshold trading days 20      
Debt instrument, convertible, threshold consecutive trading days 30      
Debt instrument, redemption price, percentage 98.00%      
Debt instrument, convertible, number of equity instruments, conversion rate | share_rate 12.0153      
Debt instrument, convertible, conversion price (USD per share) | $ / shares $ 83.23      
Number of trading days after maturity date, debt redeemable 40 days      
Effective interest rate 0.864%      
2027 Notes: | Convertible Debt | Minimum        
Debt Instrument [Line Items]        
Share price threshold, adjustment to conversion rate (USD per share) | $ / shares $ 61.65      
2027 Notes: | Convertible Debt | Maximum        
Debt Instrument [Line Items]        
Debt instrument, convertible, number of equity instruments, conversion rate | share_rate 16.2206      
Share price threshold, adjustment to conversion rate (USD per share) | $ / shares $ 325.00      
Debt covenant, percent of note holders threshold by amount of principal outstanding 25.00%      
2027 Notes: | Convertible Debt | Debt Conversion Terms One        
Debt Instrument [Line Items]        
Debt instrument, convertible, threshold trading days 20      
Debt instrument, convertible, threshold consecutive trading days 30      
2027 Notes: | Convertible Debt | Debt Conversion Terms Two        
Debt Instrument [Line Items]        
Debt instrument, convertible, threshold consecutive business days 5      
Debt instrument, convertible, threshold consecutive trading days, after threshold consecutive business days 10      
2027 Notes: | Convertible Debt | Accounts Payable        
Debt Instrument [Line Items]        
Payments of debt issuance costs | $     $ 375,000  
2026 Notes: | Convertible Debt        
Debt Instrument [Line Items]        
Debt instrument, face amount | $   $ 690,000,000    
Debt instrument, interest rate, stated percentage   0.125%    
Payments of debt issuance costs | $   $ 18,055,000    
Payments of expenses associated with initial public offering | $   25,530,000    
Repayment of credit facility | $ $ 536,062,000 $ 250,500,000    
Debt instrument, convertible, threshold percentage of stock price trigger   130.00%    
Debt instrument, convertible, threshold trading days   20    
Debt instrument, convertible, threshold consecutive trading days   30    
Debt instrument, redemption price, percentage   98.00%    
Debt instrument, convertible, number of equity instruments, conversion rate | share_rate   15.5925    
Debt instrument, convertible, conversion price (USD per share) | $ / shares   $ 64.13    
Number of trading days after maturity date, debt redeemable   40 days    
Effective interest rate   0.658%    
2026 Notes: | Convertible Debt | Minimum        
Debt Instrument [Line Items]        
Share price threshold, adjustment to conversion rate (USD per share) | $ / shares   $ 44.23    
2026 Notes: | Convertible Debt | Maximum        
Debt Instrument [Line Items]        
Debt instrument, convertible, number of equity instruments, conversion rate | share_rate   22.6090    
Share price threshold, adjustment to conversion rate (USD per share) | $ / shares   $ 210.00    
Debt covenant, percent of note holders threshold by amount of principal outstanding   25.00%    
2026 Notes: | Convertible Debt | Debt Conversion Terms One        
Debt Instrument [Line Items]        
Debt instrument, convertible, threshold trading days   20    
Debt instrument, convertible, threshold consecutive trading days   30    
2026 Notes: | Convertible Debt | Debt Conversion Terms Two        
Debt Instrument [Line Items]        
Debt instrument, convertible, threshold consecutive business days   5    
Debt instrument, convertible, threshold consecutive trading days, after threshold consecutive business days   10