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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. 27, 2020
Jun. 29, 2019
Jun. 27, 2020
Jun. 29, 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 $ 33,500   $ 33,500     $ 31,000
Self insurance liabilities, current 13,700   13,700     13,100
Self insurance liabilities, noncurrent 19,800   19,800     17,900
Receivable for expected self-insurance recoveries from excess cost insurance 4,800   4,800     $ 3,600
Employee insurance expense $ 9,400 $ 7,300 $ 27,700 $ 26,900