Retirement Plans (Schedule Of Weighted-Average Assumptions Used To Determine Projected Benefit Obligation) (Details)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	0.00%
Expected long-term rate of return on assets	8.00%	8.25%	8.25%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	4.50%	5.30%	5.90%
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	3.50%	4.40%	5.20%