Equity Compensation (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Number of Options
Number of Options, Outstanding (in shares)	2,104,000
Number of Options, Granted (in shares)	293,000	498,000	508,000
Number of Options, Exercised (in shares)	(759,000)	(697,000)	(864,000)
Number of Options, Cancelled (in shares)	(74,000)
Number of Options, Outstanding (in shares)	1,564,000	2,104,000
Number of Options, Exercisable (in shares)	893,000
Weighted Average Exercise Price
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 17.39
Weighted Average Exercise Price, Granted (in dollars per share)	$ 49.68
Weighted Average Exercise Price, Exercised (in dollars per share)	$ 13.77
Weighted Average Exercise Price, Cancelled (in dollars per share)	$ 31.83
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 24.52	$ 17.39
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 16.55
Options, Additional Disclosures
Weighted Average Remaining Contractual Term, Outstanding	5 years 4 months 28 days
Weighted Average Remaining Contractual Term, Exercisable	3 years 1 month 10 days
Aggregate Intrinsic Value, Outstanding	$ 48,640
Aggregate Intrinsic Value, Exercisable	$ 34,872