CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2023	Jun. 29, 2022	Jun. 28, 2023	Jun. 29, 2022
Revenue
Total revenue	$ 121,492	$ 124,111	$ 236,018	$ 234,159
Cost of operations
Food and paper cost	28,474	31,691	55,376	59,423
Labor and related expenses	32,277	33,015	63,818	65,687
Occupancy and other operating expenses	25,576	25,832	50,462	49,677
Gain on recovery of insurance proceeds, lost profits, net			(151)
Company restaurant expenses	86,327	90,538	169,505	174,787
General and administrative expenses	11,108	9,679	22,307	19,633
Franchise expenses	9,492	9,557	18,524	18,288
Depreciation and amortization	3,694	3,618	7,331	7,215
(Gain) loss on disposal of assets	(80)	42	(50)	108
Gain on recovery of insurance proceeds, property, equipment and expenses			(242)
Gain on disposition of restaurants	25		(111)
Impairment and closed-store reserves	38	248	115	379
Total expenses	110,604	113,682	217,379	220,410
Income from operations	10,888	10,429	18,639	13,749
Interest expense, net	976	419	1,980	849
Income tax receivable agreement expense (income)	121	(186)	(1)	(316)
Income before provision for income taxes	9,791	10,196	16,660	13,216
Provision for income taxes	2,735	3,055	4,686	3,960
Net income	$ 7,056	$ 7,141	$ 11,974	$ 9,256
Net income per share
Basic (usd per share)	$ 0.20	$ 0.20	$ 0.33	$ 0.26
Diluted (usd per share)	$ 0.20	$ 0.20	$ 0.33	$ 0.25
Weighted-average shares used in computing net income per share
Basic (shares)	35,433,414	36,331,099	35,833,759	36,278,423
Diluted (shares)	35,534,104	36,473,960	36,018,288	36,478,808
Company-operated restaurant revenue
Revenue
Total revenue	$ 103,901	$ 106,454	$ 201,774	$ 200,411
Franchise revenue
Revenue
Total revenue	10,119	10,064	19,791	19,319
Franchise advertising fee revenue
Revenue
Total revenue	$ 7,472	$ 7,593	$ 14,453	$ 14,429