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Income Taxes (Schedule Of Income Tax Expense Reconciliation) (Details) - USD ($)
12 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 28, 2013
Income Taxes [Abstract]      
Federal tax at statutory rate $ 33,060,000 $ 27,922,000 $ 9,109,000
State income tax, net of federal tax benefits 4,599,000 2,308,000 (2,204,000)
Federal tax credits (1,544,000) (718,000) (1,410,000)
Other (1,010,000) (1,162,000) (48,000)
Income tax expense $ 35,105,000 $ 28,350,000 $ 5,447,000