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Accrued Expenses and Current Portion of Other Long-Term Liabilities (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 30, 2023
Dec. 24, 2022
Sep. 30, 2023
Accrued Expenses and Current Portion of Other Long-Term Liabilities [Abstract]      
Workers' compensation per occurrence covered under insurance cost $ 1,000    
Medical care benefits per person covered under insurance cost 500    
Self insurance liabilities 34,200   $ 32,900
Self insurance liabilities, current 15,200   14,000
Self insurance liabilities, noncurrent 19,000   18,900
Receivable for expected self-insurance recoveries from excess cost insurance 4,300   $ 4,300
Employee insurance expense $ 13,100 $ 10,800