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Accrued Expenses And Current Portion Of Other Long-Term Liabilities (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Sep. 29, 2018
Accrued Expenses And Current Portion Of Other Long-Term Liabilities [Abstract]      
Workers' compensation per occurrence covered under insurance cost $ 750    
General liability 500    
Medical care benefits per person covered under insurance cost 450    
Self insurance liabilities 34,200   $ 34,700
Self insurance liabilities, current 13,400   13,600
Self insurance liabilities, noncurrent 20,800   21,100
Receivable for expected self-insurance recoveries from excess cost insurance 4,400   $ 4,600
Employee insurance expense $ 10,200 $ 8,600