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Income Taxes (Schedule Of Tax Effects Of Temporary Differences That Generated Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Sep. 28, 2019 | Sep. 29, 2018
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Income Tax Disclosure [Abstract] |  |
Benefit accruals | $ 115,683 | $ 125,566
Inventory reserves | 26,364 | 27,678
Tax benefit carryforwards | 14,196 | 16,211
Contract reserves not currently deductible | 15,382 | 11,028
Other accrued expenses | 4,918 | 6,670
Total gross deferred tax assets | 176,543 | 187,153
Less valuation allowance | (13,137) | (15,181)
Total net deferred tax assets | 163,406 | 171,972
Differences in bases and depreciation of property, plant and equipment | 121,353 | 125,132
Pension | 62,589 | 75,989
Total gross deferred tax liabilities | 183,942 | 201,121
Net deferred tax liabilities | $ (20,536) | $ (29,149)

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