Retirement Plans (Details 6)	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Pension Benefits
Net periodic benefit cost
Discount rate (as a percent)	4.92%	4.23%	4.94%
Expected long-term rate of return on assets (as a percent)	7.60%	7.56%	7.58%
Rate of compensation increase (as a percent)	3.50%	3.47%	3.49%
Benefit obligations at year-end
Discount rate as a percent	4.18%	4.94%	4.23%
Rate of compensation increases	3.49%	3.51%	3.48%
Postretirement Benefits Other than Pensions
Net periodic benefit cost
Discount rate (as a percent)	4.50%	3.75%	4.75%
Benefit obligations at year-end
Discount rate as a percent	4.00%	4.50%	3.75%