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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. 27, 2025 | Sep. 28, 2024
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Income Tax Disclosure [Abstract] |  |
Research and development | $ 86,109 | $ 64,530
Benefit accruals | 46,669 | 54,667
Inventory reserves | 28,139 | 28,435
Tax benefit carryforwards | 13,180 | 18,034
Contract reserves not currently deductible | 18,713 | 18,169
Lease liability | 15,756 | 16,191
Other accrued expenses | 0 | 2,835
Total gross deferred tax assets | 208,566 | 202,861
Less valuation allowance | (12,317) | (10,905)
Total net deferred tax assets | 196,249 | 191,956
Differences in bases and depreciation of property, plant and equipment | 189,878 | 178,868
Pension | 14,881 | 16,856
Deferred Tax Liabilities, Other | 1,631 | 0
Total gross deferred tax liabilities | 206,390 | 195,724
Net deferred tax liabilities | $ (10,141) | $ (3,768)

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