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Income Taxes (Schedule Of Deferred Income Tax Liabilities And Assets) (Details) - USD ($) | Sep. 24, 2016 | Sep. 26, 2015
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Income Taxes [Abstract] |  |
Property and equipment tax/book differences | $ 88,465,000 | $ 82,199,000
Property tax method | 1,501,000 | 1,491,000
Total deferred tax liabilities | 89,966,000 | 83,690,000
Insurance reserves | 8,390,000 | 8,607,000
Advance payments on purchases contracts | 618,000 | 652,000
Vacation accrual | 2,520,000 | 2,386,000
State tax credits | 20,000 | 271,000
Inventory | 1,720,000 | 1,939,000
Deferred compensation | 4,062,000 | 3,390,000
Other | 1,187,000 | 1,802,000
Total deferred tax assets | 18,517,000 | 19,047,000
Net deferred tax liabilities | $ 71,449,000 | $ 64,643,000

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