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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. 25, 2017
Mar. 26, 2016
Mar. 25, 2017
Mar. 26, 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 35,900   35,900   $ 35,900
Self insurance reserves, current 13,500   13,500   14,100
Self insurance reserves, noncurrent 22,400   22,400   21,800
Receivable for expected self-insurance recoveries from excess cost insurance 5,000   5,000   $ 4,800
Employee insurance expense $ 7,100 $ 10,000 $ 16,400 $ 19,200