Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2017	Dec. 29, 2015	Dec. 30, 2014
Revenue:
Restaurant revenue	$ 482,544	$ 450,482	$ 398,993
Franchising royalties and fees	4,930	4,969	4,748
Total revenue	487,474	455,451	403,741
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Cost of sales	130,630	120,455	107,217
Labor	161,219	143,145	120,492
Occupancy	55,912	50,300	42,540
Other restaurant operating costs	73,011	63,549	52,580
General and administrative	55,654	37,244	31,394
Depreciation and amortization	28,134	27,802	24,787
Pre-opening	3,131	4,407	4,425
Restaurant impairments, closure costs and asset disposals	47,311	29,616	1,391
Total costs and expenses	555,002	476,518	384,826
(Loss) income from operations	(67,528)	(21,067)	18,915
Interest expense, net	2,916	1,432	365
(Loss) income before income taxes	(70,444)	(22,499)	18,550
Provision (benefit) for income taxes	1,233	(8,734)	7,122
Net (loss) income	$ (71,677)	$ (13,765)	$ 11,428
Earnings per share of Class A and Class B common stock, combined:
Basic (USD per share)	$ (2.58)	$ (0.48)	$ 0.38
Diluted (USD per share)	$ (2.58)	$ (0.48)	$ 0.37
Weighted average shares of Class A and Class B common stock outstanding, combined:
Basic (in shares)	27,808,708	28,938,901	29,717,304
Diluted (in shares)	27,808,708	28,938,901	31,001,099