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Accrued Expenses And Current Portion Of Other Long-Term Liabilities (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 26, 2020
Dec. 28, 2019
Sep. 26, 2020
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 34,500   $ 34,100
Self insurance liabilities, current 14,200   14,100
Self insurance liabilities, noncurrent 20,300   20,000
Receivable for expected self-insurance recoveries from excess cost insurance 4,800   $ 4,700
Employee insurance expense $ 12,300 $ 10,600