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Accrued Expenses And Current Portion Of Other Long-Term Liabilities (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 26, 2022
Mar. 27, 2021
Mar. 26, 2022
Mar. 27, 2021
Sep. 25, 2021
Accrued Expenses And Current Portion Of Other Long-Term Liabilities [Abstract]          
Workers' compensation per occurrence covered under insurance cost $ 1,000   $ 1,000    
Medical care benefits per person covered under insurance cost 450   450    
Self insurance liabilities 32,300   32,300   $ 32,100
Self insurance liabilities, current 13,300   13,300   13,300
Self insurance liabilities, noncurrent 19,000   19,000   18,800
Receivable for expected self-insurance recoveries from excess cost insurance 4,200   4,200   $ 4,200
Employee insurance expense $ 7,000 $ 8,200 $ 20,300 $ 20,500