Supplemental Financial Information (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 01, 2012	Apr. 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	1,447
Accumulated net foreign currency translation adjustments, Ending Balance	43,585
Accumulated net unrealized (loss)/gain on investments, Beginning Balance	5,942
Accumulated net unrealized (loss)/gain on investments, Other Comprehensive Income	196
Accumulated net unrealized (loss)/gain on investments, Ending Balance	6,138
Accumulated net unrealized (loss)/gain on derivatives, Beginning Balance	(2,551)
Accumulated net unrealized (loss)/gain on derivatives, Other Comprehensive Income	1,313
Accumulated net unrealized (loss)/gain on derivatives, Ending Balance	(1,238)
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	3,969
Accumulated actuarial loss on pension and post-retirement plans, Ending Balance	(574,788)
Total accumulated other comprehensive income, Beginning Balance	(533,228)
Total accumulated other comprehensive income, Other Comprehensive Income	6,925	3,914
Total accumulated other comprehensive income, Ending Balance	$ (526,303)