Retirement Plans (Details 6)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Pension Benefits
Net periodic benefit cost
Discount rate (as a percent)	4.23%	4.94%	5.71%
Expected long-term rate of return on assets (as a percent)	7.56%	7.58%	7.84%
Rate of compensation increase (as a percent)	3.31%	3.49%	3.99%
Benefit obligations at year-end
Discount rate as a percent	4.94%	4.23%	4.95%
Rate of compensation increases	3.34%	3.48%	3.49%
Postretirement Benefits Other than Pensions
Net periodic benefit cost
Discount rate (as a percent)	3.75%	4.75%	5.50%
Benefit obligations at year-end
Discount rate as a percent	4.50%	3.75%	4.75%