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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. 27, 2021
Mar. 28, 2020
Mar. 27, 2021
Mar. 28, 2020
Sep. 26, 2020
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 34,300   34,300   $ 34,100
Self insurance liabilities, current 14,100   14,100   14,100
Self insurance liabilities, noncurrent 20,200   20,200   20,000
Receivable for expected self-insurance recoveries from excess cost insurance 5,300   5,300   $ 4,700
Employee insurance expense $ 8,200 $ 7,800 $ 20,500 $ 18,300