Consolidated Statements Of Income And Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 17, 2014	Jun. 11, 2013	Jun. 17, 2014	Jun. 11, 2013
Consolidated Statements Of Income And Comprehensive Income [Abstract]
Revenues	$ 67,386	$ 60,359	$ 134,008	$ 120,162
Costs and expenses:
Costs of sales	20,292	18,113	40,344	36,533
Restaurant operating expenses	30,037	26,909	60,608	53,454
Marketing and advertising costs	1,386	1,347	2,607	2,256
Pre-opening costs	906	328	1,290	919
General and administrative costs	4,844	4,163	9,530	7,938
Secondary public offering costs			5	412
Public offering transaction bonuses				1,805
Depreciation and amortization	3,001	2,564	5,956	5,006
Operating income	6,920	6,935	13,668	11,839
Other income (expense), net:
Interest expense	(16)	(24)	(31)	(48)
Other	(22)		(39)
Income before income taxes	6,882	6,911	13,598	11,791
Income tax expense	2,113	2,480	4,308	3,791
Net income	4,769	4,431	9,290	8,000
Basic income (loss) per common share:
Basic income per common share	$ 0.20	$ 0.19	$ 0.39	$ 0.34
Diluted income (loss) per common share:
Diluted income per common share	$ 0.20	$ 0.19	$ 0.39	$ 0.34
Shares used in computing net income (loss) per common share:
Basic	23,578,703	23,794,667	23,603,045	23,794,667
Diluted	23,846,766	23,826,622	23,852,881	23,794,869
Comprehensive income	$ 4,769	$ 4,431	$ 9,290	$ 8,000