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Income Taxes (Schedule Of Income Tax Expense Reconciliation) (Details) - USD ($)	12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Income Taxes [Abstract]
Federal tax at statutory rate	$ 22,386,000	$ 19,678,000	$ 29,492,000
State income tax, net of federal tax benefits	3,726,000	3,528,000	2,774,000
Federal tax credits	(1,184,000)	(1,052,000)	(1,024,000)
Tax rate change on deferred tax balance as of Federal law enactment date		(26,680,000)
Tax method change		(10,606,000)
Tax rate change effect of FY18 current deferred activity		(2,124,000)
Other	90,000	210,000	(854,000)
Total expense (benefit)	$ 25,018,000	$ (17,046,000)	$ 30,388,000

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