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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. 25, 2023
Mar. 26, 2022
Mar. 25, 2023
Mar. 26, 2022
Sep. 24, 2022
Accrued Expenses And Current Portion Of Other Long-Term Liabilities [Abstract]          
Workers' compensation per occurrence covered under insurance cost $ 1,000   $ 1,000    
Medical care benefits per person covered under insurance cost 475   475    
Self insurance liabilities 31,100   31,100   $ 31,000
Self insurance liabilities, current 13,000   13,000   13,200
Self insurance liabilities, noncurrent 18,100   18,100   17,800
Receivable for expected self-insurance recoveries from excess cost insurance 4,200   4,200   $ 4,000
Employee insurance expense $ 8,100 $ 7,000 $ 19,000 $ 20,300