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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. 30, 2019
Mar. 31, 2018
Mar. 30, 2019
Mar. 31, 2018
Sep. 29, 2018
Accrued Expenses And Current Portion Of Other Long-Term Liabilities [Abstract]          
Workers' compensation per occurrence covered under insurance cost $ 750   $ 750    
General liability 500   500    
Medical care benefits per person covered under insurance cost 450   450    
Self insurance liabilities 33,700   33,700   $ 34,700
Self insurance liabilities, current 13,400   13,400   13,600
Self insurance liabilities, noncurrent 20,300   20,300   21,100
Receivable for expected self-insurance recoveries from excess cost insurance 3,900   3,900   $ 4,600
Employee insurance expense $ 9,400 $ 10,400 $ 19,600 $ 19,000