Pension, Retiree Medical and Savings Plans Pension, Retiree Medical and Savings Plans (Target Asset Allocations) (Details)	12 Months Ended
	Dec. 29, 2012 Fixed Income [Member]	Dec. 29, 2012 U.S. Equity [Member]	Dec. 29, 2012 International Equity [Member]	Dec. 29, 2012 Real Estate [Member]	Dec. 28, 2013 Scenario, Forecast [Member] Fixed Income [Member]	Dec. 28, 2013 Scenario, Forecast [Member] U.S. Equity [Member]	Dec. 28, 2013 Scenario, Forecast [Member] International Equity [Member]	Dec. 28, 2013 Scenario, Forecast [Member] Real Estate [Member]
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%