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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. 30, 2018
Jun. 24, 2017
Jun. 30, 2018
Jun. 24, 2017
Sep. 30, 2017
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 34,200   34,200   $ 35,500
Self insurance liabilities, current 13,200   13,200   13,300
Self insurance liabilities, noncurrent 21,000   21,000   22,200
Receivable for expected self-insurance recoveries from excess cost insurance 4,800   4,800   $ 4,800
Employee insurance expense $ 8,100 $ 8,000 $ 27,100 $ 24,400