SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Risk (Details) - item	12 Months Ended
	Dec. 27, 2023	Dec. 28, 2022	Dec. 29, 2021
Accounts Receivable
Concentration of Risk
Number Of Franchisee	1
Supplier Concentration Risk | Accounts Payable
Concentration of Risk
Number Of Suppliers	1	1
Supplier Concentration Risk | Supplier One | Accounts Payable
Concentration of Risk
Percentage of concentration	15.14%	41.70%
Supplier Concentration Risk | Largest Supplier One | Purchased
Concentration of Risk
Percentage of concentration	26.60%	28.50%	27.10%
Geographic Concentration Risk | Revenue
Concentration of Risk
Percentage of concentration	100.00%	100.00%	100.00%
Franchised | Accounts Receivable
Concentration of Risk
Number Of Franchisee		1
Franchised | Geographic Concentration Risk | Accounts Receivable
Concentration of Risk
Percentage of concentration	11.40%	12.90%
Greater Los Angeles area market | Geographic Concentration Risk | Revenue
Concentration of Risk
Percentage of concentration	71.30%	71.20%	70.90%