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Debt - Credit Agreement - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 27, 2020
Jun. 30, 2021
Jun. 27, 2020
Feb. 13, 2020
Debt Instrument [Line Items]          
Credit facility amount         $ 1,000,000,000
Periodic interest payment $ 3,200,000 $ 16,400,000 $ 23,700,000 $ 40,000,000.0  
Interest rate during period 3.10% 4.00% 3.40% 4.50%  
6.000% Senior Notes Due 2024          
Debt Instrument [Line Items]          
Amount paid in penalties for early redemption   $ 15,000,000      
Interest rate   6.00%   6.00%  
Line of Credit          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity expansion amount         $ 500,000,000
Credit facility maturity date     Feb. 13, 2025    
Basis spread on Federal Reserve Bank of New York (FRBNY) rate 0.50%   0.50%    
Basis spread on adjusted LIBOR     1.00%    
Line of Credit | Minimum          
Debt Instrument [Line Items]          
Variable interest rate, length of time between updates     30 days    
Credit facility commitment fees percentage     0.175%    
Line of Credit | Minimum | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Basis spread on variable rate     1.25%    
Line of Credit | Minimum | Base Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate     0.25%    
Line of Credit | Maximum          
Debt Instrument [Line Items]          
Variable interest rate, length of time between updates     180 days    
Credit facility commitment fees percentage     0.30%    
Line of Credit | Maximum | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Basis spread on variable rate     1.75%    
Line of Credit | Maximum | Base Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate     0.75%    
Secured Debt | Revolving Loan, Reset Period One          
Debt Instrument [Line Items]          
Annual rate for borrowings outstanding 1.69%   1.69%