Pension And Other Post Retirement Benefits Narrative (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 29, 2015	Mar. 30, 2014	Dec. 31, 2015
Other Post Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer	$ 100,000	$ 1,000,000
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer		2,000,000
Scenario, Forecast | Other Post Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer			1,000,000
Scenario, Forecast | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer			$ 0