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Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 27, 2025
Sep. 28, 2024
Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]      
Accrued liability for cash bonuses $ 18,600 $ 21,500  
Investment Profit Sharing Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Operating and administrative expenses 6,300 5,700 $ 5,700
Nonqualified Investment Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Operating and administrative expenses 511 564 509
Cash Bonuses [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Operating and administrative expenses $ 20,500 $ 29,200 $ 34,400