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Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 24, 2022
Sep. 25, 2021
Defined Benefit Plan Disclosure [Line Items]      
Accrued liability for cash bonuses $ 23,600 $ 26,000  
Investment Profit Sharing Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Operating and administrative expenses 5,700 5,000 $ 5,100
Nonqualified Investment Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Operating and administrative expenses 509 440 375
Cash Bonuses [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Operating and administrative expenses $ 34,400 $ 32,300 $ 27,200