Supplemental Financial Information (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011
Accumulated Other Comprehensive Loss, net of taxes
Accumulated net foreign currency translation adjustments, Beginning Balance			$ 42,138
Accumulated net foreign currency translation adjustments, Other Comprehensive Income			(3,397)
Accumulated net foreign currency translation adjustments, Ending Balance	38,741		38,741
Accumulated net unrealized (loss)/gain on investments, Beginning Balance			5,942
Accumulated net unrealized (loss)/gain on investments, Other Comprehensive Income			(169)
Accumulated net unrealized (loss)/gain on investments, Ending Balance	5,773		5,773
Accumulated net unrealized (loss)/gain on derivatives, Beginning Balance			(2,551)
Accumulated net unrealized (loss)/gain on derivatives, Other Comprehensive Income			659
Accumulated net unrealized (loss)/gain on derivatives, Ending Balance	(1,892)		(1,892)
Accumulated actuarial loss on pension and post-retirement plans, Beginning Balance			(578,757)
Accumulated actuarial loss on pension and post-retirement plans, Other Comprehensive Income			8,152
Accumulated actuarial loss on pension and post-retirement plans, Ending Balance	(570,605)		(570,605)
Total accumulated other comprehensive income, Beginning Balance			(533,228)
Total accumulated other comprehensive income, Other Comprehensive Income	(1,680)	1,196	5,245	5,110
Total accumulated other comprehensive income, Ending Balance	$ (527,983)		$ (527,983)