Pension, Retiree Medical and Savings Plans Pension, Retiree Medical and Savings Plans (Target Asset Allocations) (Details)	12 Months Ended
	Dec. 28, 2013 Fixed Income	Dec. 28, 2013 U.S. Equity	Dec. 28, 2013 International Equity	Dec. 28, 2013 Real Estate	Dec. 27, 2014 Scenario, Forecast Fixed Income	Dec. 27, 2014 Scenario, Forecast U.S. Equity	Dec. 27, 2014 Scenario, Forecast International Equity	Dec. 27, 2014 Scenario, Forecast Real Estate
Target Asset Allocation [Line Items]
Target investment allocation percentage	40.00%	33.00%	22.00%	5.00%	40.00%	33.00%	22.00%	5.00%