Equity Compensation - Fair Value (Details) - Options	12 Months Ended
	Dec. 25, 2016	Dec. 27, 2015	Dec. 28, 2014
Assumptions (weighted average):
Risk-free interest rate (as a percent)	1.30%	1.60%	1.80%
Expected dividend yield (as a percent)	1.20%	0.90%	1.00%
Expected volatility (as a percent)	27.40%	28.50%	35.70%
Expected term (in years)	5 years 6 months	5 years 6 months	6 years