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Accrued Expenses And Current Portion Of Other Long-Term Liabilities (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 24, 2016
Dec. 26, 2015
Sep. 24, 2016
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 325    
Self insurance reserves 36,700   $ 35,900
Self insurance reserves, current 14,200   14,100
Self insurance reserves, noncurrent 22,500   21,800
Receivable for expected self-insurance recoveries from excess cost insurance 4,800   $ 4,800
Employee insurance expense $ 9,300 $ 9,200