Employee Benefit Plans (Narrative) (Details) (USD $)	3 Months Ended
	Apr. 01, 2012	Mar. 27, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Curtailment loss	$ (200,000)
Pension And Postretirement Healthcare Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Funded status adjustment	(900,000)
Company contributions	200,000,000
Pension And SERPA Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Curtailment loss		(236,000)
Discount rate, benefit obligations	5.76%		5.79%
Other comprehensive income, net of tax	500,000
Postretirement Healthcare Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate, benefit obligations	5.30%		5.28%
Increase in other comprehensive income	900,000
Company contributions		$ 200,000,000