SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended
	Mar. 26, 2025 USD ($) segment	Mar. 27, 2024 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment	1
Number of reportable segments | segment	1
Segment Reporting, Other Segment Item, Composition, Description	Other segment expenses include loss on disposal of assets, gain on recovery of insurance proceeds, property, equipment and expenses and impairment and closed-store reserves.	Other segment expenses include loss on disposal of assets, gain on recovery of insurance proceeds, property, equipment and expenses and impairment and closed-store reserves.
Total revenue	$ 119,177	$ 116,153
Less:
Food and paper costs	(24,739)	(25,619)
Labor and related expenses	(32,179)	(30,580)
General and administrative expenses	(11,263)	(11,925)
Franchise expenses	(12,442)	(10,602)
Depreciation and amortization	(3,887)	(3,851)
Total operating expenses	(110,205)	(106,474)
Income from operations	8,972	9,679
Interest expenses, net	(1,176)	(1,564)
Provision for income taxes	(2,315)	(2,203)
Income tax receivable agreement (income) expenses	0	0
Total segment net income	5,481	5,912
Single reportable segment
Segment Reporting Information [Line Items]
Total revenue	119,177	116,153
Less:
Food and paper costs	(24,739)	(25,619)
Labor and related expenses	(32,179)	(30,580)
General and administrative expenses	(11,263)	(11,925)
Franchise expenses	(12,442)	(10,602)
Occupancy expenses	(7,929)	(7,515)
Other operating expenses	(17,744)	(16,350)
Depreciation and amortization	(3,887)	(3,851)
Other segment expenses	(22)	(32)
Total operating expenses	(110,205)	(106,474)
Income from operations	8,972	9,679
Interest expenses, net	(1,176)	(1,564)
Provision for income taxes	(2,315)	(2,203)
Total segment net income	$ 5,481	$ 5,912