CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2022	Dec. 29, 2021	Dec. 30, 2020
Revenue
Total revenue	$ 469,959	$ 454,363	$ 426,087
Cost of operations
Food and paper cost	117,774	104,394	98,774
Labor and related expenses	130,773	120,308	114,455
Occupancy and other operating expenses	101,543	97,557	92,422
Gain on recovery of insurance proceeds, lost profits			(2,000)
Company restaurant expenses	350,090	322,259	303,651
General and administrative expenses	39,093	39,852	35,918
Legal settlements			2,566
Franchise expenses	36,169	32,831	28,761
Depreciation and amortization	14,418	15,176	16,878
Loss on disposal of assets	165	289	189
Recovery of securities lawsuits related legal expenses and other insurance claims			(123)
(Gain) loss on disposition of restaurants	(848)	1,534
Impairment and closed-store reserves	752	1,087	4,691
Total expenses	439,839	413,028	392,531
Income from operations	30,120	41,335	33,556
Interest expense, net	1,677	1,824	3,292
Income tax receivable agreement (income) expense	(436)	58	139
Income before provision for income taxes	28,879	39,453	30,125
Provision for income taxes	8,078	10,332	5,651
Net income	$ 20,801	$ 29,121	$ 24,474
Net income per share
Basic (usd per share)	$ 0.57	$ 0.81	$ 0.70
Diluted (usd per share)	$ 0.57	$ 0.80	$ 0.68
Weighted-average shares used in computing net income per share
Basic (shares)	36,350,579	35,973,892	35,193,325
Diluted (shares)	36,575,904	36,446,756	35,796,406
Company-operated restaurant revenue
Revenue
Total revenue	$ 403,218	$ 394,733	$ 374,064
Franchise revenue
Revenue
Total revenue	38,225	33,729	29,418
Franchise advertising fee revenue
Revenue
Total revenue	$ 28,516	$ 25,901	$ 22,605