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
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)