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
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)