Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended	12 Months Ended		12 Months Ended							0 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2013 restaurant	Mar. 27, 2012	Dec. 31, 2013 item	Dec. 25, 2012	Dec. 31, 2013 Irving lease item	Dec. 31, 2013 Louisville lease item	Dec. 31, 2013 Everett, Massachusetts item	Dec. 31, 2013 Longmont, Colorado item	Dec. 31, 2013 Montgomeryville, Pennsylvania item	Dec. 31, 2013 Fargo, North Dakota item	Dec. 31, 2013 Logan, Utah item	Dec. 31, 2013 Aspen Creek concept restaurant	Dec. 31, 2013 Aspen Creek concept restaurant	Dec. 31, 2013 Aspen Creek concept restaurant
Commitments and Contingencies
Estimated cost to complete capital project commitments (in dollars)	$ 65.2		$ 65.2	$ 73.2
Real estate lease agreements
Number of restaurants sold	2											2	2	2
Number of lease renewal terms					3	3	3	3	3	3	3
Lease renewal term					5 years	5 years	5 years	5 years	5 years	5 years	5 years
Number of franchises with real estate lease agreements			5
Ownership percentage	5.00%		5.00%
Amount of liability recorded for guarantees			0
Number of suppliers providing most of the company's beef			4
Material minimum purchase commitments	0		0
Minimum age specified in age discrimination allegation against entity			40 years
Settlement expense		$ 5.0