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Income Taxes (Schedule Of Income Tax Expense Reconciliation) (Details) - USD ($)
12 Months Ended
Sep. 24, 2016
Sep. 26, 2015
Sep. 27, 2014
Income Taxes [Abstract]      
Federal tax at statutory rate $ 29,622,000 $ 33,060,000 $ 27,922,000
State income tax, net of federal tax benefits 2,554,000 4,599,000 2,308,000
Federal tax credits (1,312,000) (1,544,000) (718,000)
Other (419,000) (1,010,000) (1,162,000)
Income tax expense $ 30,445,000 $ 35,105,000 $ 28,350,000