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Accrued Expenses And Current Portion Of Other Long-Term Liabilities (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 24, 2017
Jun. 25, 2016
Jun. 24, 2017
Jun. 25, 2016
Sep. 24, 2016
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 reserves 35,300   35,300   $ 35,900
Self insurance reserves, current 13,300   13,300   14,100
Self insurance reserves, noncurrent 22,000   22,000   21,800
Receivable for expected self-insurance recoveries from excess cost insurance 5,100   5,100   $ 4,800
Employee insurance expense $ 8,000 $ 7,700 $ 24,400 $ 26,800