Employee Benefit Plans (Weighted Average Assumptions Used To Determine Benefit Obligations) (Details)	12 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 29, 2013
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Discount rate	2.51%	2.01%
Expected rate of increase in future compensation levels	2.52%	2.52%
Discount rate	2.01%	3.52%	3.53%
Expected rate of return on plan assets	2.25%	3.90%	4.50%
Expected rate of increase in future compensation levels	2.52%	2.53%	2.52%