SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Gain on Recovery of Insurance Proceeds (Details) $ in Thousands	12 Months Ended
	Dec. 27, 2023 USD ($) restaurant	Dec. 28, 2022 USD ($) restaurant	Dec. 29, 2021 USD ($) restaurant
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Gain on recovery of insurance proceeds	$ 327
Insurance proceeds	$ 163
Restaurants sold | restaurant	18
Proceeds from disposition of restaurants	$ 7,722	$ 1,002	$ 4,556
Gain on sale of restaurants	5,034	848	(1,534)
Gain on recovery of insurance proceeds, property, equipment and expenses	247
Received from the insurance	500
Loss on disposal of assets	$ (192)	$ (165)	(289)
Diep v. Sather
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Insurance proceeds			469,000
Orange County | Restaurant Sales
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Number Of Restaurants, Sold To Third Party | restaurant		3
Orange County | Restaurant Sales | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Proceeds from disposition of restaurants		$ 1,000
Gain on sale of restaurants		$ 800
Sacramento Area | Restaurant Sales | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Proceeds from disposition of restaurants			4,600
Gain on sale of restaurants			$ (1,500)
Number Of Restaurants, Sold To Third Party | restaurant			8
Fire
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Number of Restaurants | restaurant	2	2
Fire | Maximum
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Incurred costs	$ 100