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Accrued Expenses And Current Portion Of Other Long-Term Liabilities (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 25, 2021
Dec. 26, 2020
Sep. 25, 2021
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 450    
Self insurance liabilities 32,100   $ 32,100
Self insurance liabilities, current 13,400   13,300
Self insurance liabilities, noncurrent 18,700   18,800
Receivable for expected self-insurance recoveries from excess cost insurance 4,200   $ 4,200
Employee insurance expense $ 13,400 $ 12,300