Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 item	Jan. 01, 2013
Employee Benefit Plans
Number of restaurant concepts for which section 401(k) is open to participation by staff members	3
Minimum number of investment options available to participating plan members	1
Maximum amount of eligible bonuses that may be deferred by participating staff members under the ESP (as a percent)	100.00%
Accrued liability for self-insured medical benefit plan	$ 41.1	$ 4.9