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Income Taxes (Schedule Of Income Tax Expense Reconciliation) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 24, 2016	Sep. 26, 2015
Income Taxes [Abstract]
Federal tax at statutory rate	$ 29,492,000	$ 29,622,000	$ 33,060,000
State income tax, net of federal tax benefits	2,774,000	2,554,000	4,599,000
Federal tax credits	(1,024,000)	(1,312,000)	(1,544,000)
Other	(854,000)	(419,000)	(1,010,000)
Income tax expense	$ 30,388,000	$ 30,445,000	$ 35,105,000

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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