CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2023	Sep. 28, 2022	Sep. 27, 2023	Sep. 28, 2022
Revenue
Total revenue	$ 120,399	$ 119,878	$ 356,417	$ 354,037
Cost of operations
Food and paper cost	27,552	30,163	82,928	89,586
Labor and related expenses	33,092	33,279	96,910	98,966
Occupancy and other operating expenses	27,289	26,920	77,751	76,597
Gain on recovery of insurance proceeds, lost profits, net			(151)
Company restaurant expenses	87,933	90,362	257,438	265,149
General and administrative expenses	9,144	9,855	31,451	29,488
Franchise expenses	9,583	9,027	28,107	27,315
Depreciation and amortization	3,946	3,530	11,277	10,745
Loss (gain) on disposal of assets	16	21	(34)	129
Gain on recovery of insurance proceeds, property, equipment and expenses			(242)
Gain on disposition of restaurants	(4,923)		(5,034)
Impairment and closed-store reserves	1,008	219	1,123	598
Total expenses	106,707	113,014	324,086	333,424
Income from operations	13,692	6,864	32,331	20,613
Interest expense, net	1,382	108	3,362	957
Income tax receivable agreement expense (income)	106	(29)	105	(345)
Income before provision for income taxes	12,204	6,785	28,864	20,001
Provision for income taxes	2,975	1,776	7,661	5,736
Net income	$ 9,229	$ 5,009	$ 21,203	$ 14,265
Net income per share
Basic (usd per share)	$ 0.28	$ 0.14	$ 0.61	$ 0.39
Diluted (usd per share)	$ 0.28	$ 0.14	$ 0.60	$ 0.39
Weighted-average shares used in computing net income per share
Basic (shares)	33,412,674	36,402,899	35,026,731	36,329,938
Diluted (shares)	33,490,004	36,507,050	35,179,483	36,491,624
Company-operated restaurant revenue
Revenue
Total revenue	$ 102,703	$ 103,174	$ 304,477	$ 303,585
Franchise revenue
Revenue
Total revenue	10,255	9,543	30,046	28,862
Franchise advertising fee revenue
Revenue
Total revenue	$ 7,441	$ 7,161	$ 21,894	$ 21,590