Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2024	Jan. 03, 2023	Dec. 28, 2021
Revenue:
Total revenue	$ 503,405	$ 509,480	$ 475,152
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Other restaurant operating costs	91,559	91,220	83,603
General and administrative	51,833	49,903	47,535
Depreciation and amortization	26,792	23,268	22,333
Pre-opening	2,215	1,662	665
Restaurant impairments, closure costs and asset disposals	8,400	6,164	5,727
Total costs and expenses	508,434	510,312	469,335
(Loss) income from operations	(5,029)	(832)	5,817
Interest expense, net	4,803	2,445	2,082
(Loss) income before income taxes	(9,832)	(3,277)	3,735
Provision for income taxes	24	37	70
Net (loss) income	$ (9,856)	$ (3,314)	$ 3,665
(Loss) earnings per Class A and Class B common stock, combined
Basic (USD per share)	$ (0.21)	$ (0.07)	$ 0.08
Diluted (USD per share)	$ (0.21)	$ (0.07)	$ 0.08
Weighted average Class A and Class B common stock outstanding, combined
Basic (in shares)	45,863,719	45,913,787	45,483,029
Diluted (in shares)	45,863,719	45,913,787	46,125,386
Restaurant revenue
Revenue:
Total revenue	$ 492,648	$ 498,359	$ 467,336
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Restaurant operating costs	124,102	137,859	117,894
Franchising royalties and fees, and other
Revenue:
Total revenue	10,757	11,121	7,816
Labor
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Restaurant operating costs	157,608	155,023	145,622
Occupancy
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Restaurant operating costs	$ 45,925	$ 45,213	$ 45,956