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Leases and Rental Expense (Narrative) (Details) - USD ($)
 12 Months Ended
Sep. 28, 2024
Sep. 30, 2023
Sep. 24, 2022
Leases and Rental Expense [Abstract]      
Initial terms of leases 20 years    
Rent expense for all operating leases $ 9,700,000 $ 10,600,000 $ 10,900,000
Operating sub-lease rental income 300,000 300,000 300,000
Finance lease cost 318,500 270,700 $ 0
Finance lease, amortization expense 275,600 231,300  
Finance lease, interest expense 82,300 $ 87,200  
Lease extension exercised, increase in operating lease assets and liabilities $ 6,200,000    
Operating lease weighted average remaining lease term 14 years 10 months 24 days    
Operating lease weighted average discount rate 3.90%    
Finance lease weighted average discount rate 6.00%