Employee Benefit Plans - Schedule of Weighted-Average Assumptions Used (Details)	12 Months Ended
	Dec. 30, 2016	Dec. 25, 2015
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit Cost for Current Plan Year	7.00%	7.25%
Benefit Cost for Subsequent Plan Year	6.75%	7.00%
Benefit Cost for Plan Year	4.30%	4.00%
Benefit Obligation at End of Plan Year	4.08%	4.30%
Salary Scale Inflation	4.60%	4.60%
Post-retirement Medical Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit Cost for Plan Year	3.85%	3.60%
Benefit Obligation at End of Plan Year	3.71%	3.85%