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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. 28, 2020
Mar. 30, 2019
Mar. 28, 2020
Mar. 30, 2019
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 $ 33,600   $ 33,600     $ 31,000
Self insurance liabilities, current 13,600   13,600     13,100
Self insurance liabilities, noncurrent 20,000   20,000     17,900
Receivable for expected self-insurance recoveries from excess cost insurance 5,400   5,400     $ 3,600
Employee insurance expense $ 7,800 $ 9,400 $ 18,300 $ 19,600