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Leases and Rental Expenses (Narrative) (Details) - USD ($) | 12 Months Ended
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Sep. 27, 2025 | Sep. 28, 2024 | Sep. 30, 2023
Leases and Rental Expense [Abstract] |  |  |
Initial terms of leases | 20 years |  |
Rent expense for all operating leases | $ 7,400,000 | $ 9,700,000 | $ 10,600,000
Operating sub-lease rental income | 300,000 | 300,000 | 300,000
Finance lease cost | 840,000.0 | 318,500 | 270,700
Finance lease, amortization expense | 674,800 | 275,600 | 231,300
Finance lease, interest expense | 165,200 | $ 82,300 | $ 87,200
Lease extension exercised, decrease in operating lease assets and liabilities | $ 3,800,000 |  |
Operating lease weighted average remaining lease term | 14 years 4 months 24 days |  |
Operating lease weighted average discount rate | 4.20% |  |
Finance lease weighted average discount rate | 6.00% |  |

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