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Income Taxes (Schedule Of Deferred Income Tax Liabilities And Assets) (Details) - USD ($)	Sep. 28, 2019	Sep. 29, 2018
Income Taxes [Abstract]
Property and equipment tax/book differences	$ 88,151,000	$ 87,577,000
Property tax method	1,228,000	1,156,000
Total deferred tax liabilities	89,379,000	88,733,000
Insurance reserves	4,280,000	4,790,000
Advance payments on purchases contracts	698,000	761,000
Vacation accrual	1,723,000	1,652,000
Inventory	1,086,000	1,055,000
Deferred compensation	4,002,000	3,662,000
Other	2,091,000	2,352,000
Total deferred tax assets	13,880,000	14,272,000
Net deferred tax liabilities	$ 75,499,000	$ 74,461,000

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