Equity Compensation - Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 25, 2016	Dec. 27, 2015	Dec. 28, 2014
Equity Compensation
Proceeds from exercise of stock options	$ 7,060	$ 5,197	$ 5,837
Number of Options
Number of Options, Outstanding (in shares)	1,419,000
Number of Options, Granted (in shares)	403,000	330,000	293,000
Number of Options, Exercised (in shares)	(478,000)	(441,000)	(759,000)
Number of Options, Cancelled (in shares)	(28,000)
Number of Options, Outstanding (in shares)	1,316,000	1,419,000
Number of Options, Exercisable (in shares)	652,000
Weighted Average Exercise Price
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 35.10
Weighted Average Exercise Price, Granted (in dollars per share)	59.35
Weighted Average Exercise Price, Exercised (in dollars per share)	22.57
Weighted Average Exercise Price, Cancelled (in dollars per share)	58.47
Weighted Average Exercise Price, Outstanding (in dollars per share)	46.58	$ 35.10
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 32.91
Options, Additional Disclosures
Weighted Average Remaining Contractual Term, Outstanding	7 years 6 months
Weighted Average Remaining Contractual Term, Exercisable	6 years 3 months 18 days
Aggregate Intrinsic Value, Outstanding	$ 53,153
Aggregate Intrinsic Value, Exercisable	$ 35,233