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Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 28, 2024
Sep. 30, 2023
Sep. 24, 2022
Defined Benefit Plan Disclosure [Line Items]      
Accrued liability for cash bonuses $ 21,500 $ 23,600  
Investment Profit Sharing Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Operating and administrative expenses 5,700 5,700 $ 5,000
Nonqualified Investment Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Operating and administrative expenses 564 509 440
Cash Bonuses [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Operating and administrative expenses $ 29,200 $ 34,400 $ 32,300