Other Postretirement Benefits - Schedule of Assumptions Used (Details) - Other Postretirement Benefit Plans, Defined Benefit [Member]	12 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 29, 2013
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	4.04%	3.61%
Estimated increase in compensation level used to calculate benefit obligation	3.50%	3.50%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate used to calculate net periodic benefit cost	3.74%	4.22%	3.70%
Estimated increase in compensation level use to calculate net periodic benefit cost	3.50%	3.50%	3.50%