Postretirement Health Care (Narrative) (Details) (Other Postretirement Benefit Plans, Defined Benefit [Member])	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rates at fiscal year-end	3.70%	4.40%	5.40%
Discount rate, used to determine net periodic benefit cost	3.70%