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Income Taxes (Components Of Net Deferred Tax Assets) (Details) (USD $) In Thousands	Sep. 30, 2011	Oct. 01, 2010
Income Taxes
Defined benefit pension plans	$ 80,632	$ 108,826
Other employee benefit plans	151,855	137,810
Self-insurance programs	14,999	19,481
Contract revenues and costs	15,333	13,602
Foreign tax credits carryforward	320	14,305
Other	9,081	10,719
Gross deferred tax assets	272,220	304,743
Depreciation and amortization	(130,536)	(81,693)
Other, net	(7,068)	(792)
Gross deferred tax liabilities	(137,604)	(82,485)
Net deferred tax assets	$ 134,616	$ 222,258

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