REFRANCHISING - Schedule of Operating Results of Refranchising Program (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2022	Jun. 27, 2021	Jun. 26, 2022	Jun. 27, 2021
Long Lived Assets Held-for-sale [Line Items]
Refranchising (loss) gain	$ (453)	$ 856	$ (1,001)	$ 429
Restaurant sales | Assets classified as held for sale
Long Lived Assets Held-for-sale [Line Items]
Restaurant costs and expenses, net of revenue	500	200	1,000	700
Gain on store sales or closures	0	1,100	0	1,100
Refranchising (loss) gain	$ (500)	$ 900	$ (1,000)	$ 400