Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2020	Dec. 25, 2019	Dec. 26, 2018
Revenue
Total revenue	$ 426,087	$ 442,330	$ 435,828
Cost of operations
Food and paper cost	98,774	109,264	111,142
Labor and related expenses	114,455	116,703	112,417
Occupancy and other operating expenses	92,422	92,005	91,385
Gain on recovery of insurance proceeds, lost profits	(2,000)	0	0
Company restaurant expenses	303,651	317,972	314,944
General and administrative expenses	35,918	40,389	50,261
Legal settlements	2,566	0	36,258
Franchise expenses	28,761	27,612	24,429
Depreciation and amortization	16,878	17,855	17,825
Loss on disposal of assets	189	266	278
Recovery of securities lawsuits related legal expenses and other insurance claims	(123)	(10,000)	(8,356)
Impairment and closed-store reserves	4,691	4,852	9,650
Loss on disposition of restaurants	0	5,058	0
Total expenses	392,531	404,004	445,289
Income (loss) from operations	33,556	38,326	(9,461)
Interest expense, net	3,292	3,687	3,502
Income tax receivable agreement expense (income)	139	57	(761)
Income (loss) before provision (benefit) for income taxes	30,125	34,582	(12,202)
Provision (benefit) for income taxes	5,651	9,682	(3,208)
Net income (loss)	$ 24,474	$ 24,900	$ (8,994)
Net income (loss) per share
Basic (usd per share)	$ 0.70	$ 0.68	$ (0.23)
Diluted (usd per share)	$ 0.68	$ 0.67	$ (0.23)
Weighted-average shares used in computing net income (loss) per share
Basic (shares)	35,193,325	36,739,209	38,574,553
Diluted (shares)	35,796,406	37,441,503	38,574,553
Company-operated restaurant revenue
Revenue
Total revenue	$ 374,064	$ 391,112	$ 388,835
Franchise revenue
Revenue
Total revenue	29,418	28,819	25,771
Franchise advertising fee revenue
Revenue
Total revenue	$ 22,605	$ 22,399	$ 21,222