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Accrued Expenses And Current Portion Of Other Long-Term Liabilities (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Oct. 01, 2019
Sep. 28, 2019
Accrued Expenses And Current Portion Of Other Long-Term Liabilities [Abstract]        
Workers' compensation per occurrence covered under insurance cost     $ 1,000  
Medical care benefits per person covered under insurance cost     $ 450  
Self insurance liabilities $ 32,000     $ 31,000
Self insurance liabilities, current 13,500     13,100
Self insurance liabilities, noncurrent 18,500     17,900
Receivable for expected self-insurance recoveries from excess cost insurance 3,700     $ 3,600
Employee insurance expense $ 10,600 $ 10,200