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Leases and Rental Expense (Narrative) (Details) - USD ($)
 12 Months Ended
Sep. 30, 2023
Sep. 24, 2022
Sep. 25, 2021
Operating Leased Assets [Line Items]      
Initial terms of leases 20 years    
Rent expense for all operating leases $ 10,600,000 $ 10,900,000 $ 11,100,000
Operating sub-lease rental income 300,000 300,000 300,000
Finance lease cost 270,700,000 0 $ 0
Finance lease, amortization expense 231,300,000    
Finance lease, interest expense 87,200,000    
Lease extension exercised, increase in operating lease assets and liabilities $ 7,900,000    
Operating lease weighted average remaining lease term 12 years 2 months 12 days    
Property and equipment $ 1,431,872,289 $ 1,374,031,169  
Current portion of finance lease liabilities 635,559    
Noncurrent finance lease liabilities $ 3,059,938    
Operating lease weighted average discount rate 5.50%    
Finance lease weighted average discount rate 6.00%    
New Financing Leases [Member]      
Operating Leased Assets [Line Items]      
Property and equipment $ 3,900,000    
Current portion of finance lease liabilities 600,000    
Noncurrent finance lease liabilities $ 3,100,000