SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Risk (Details) - item	12 Months Ended
	Dec. 31, 2025	Dec. 25, 2024	Dec. 27, 2023
Supplier Concentration Risk | Supplier One | Accounts Payable
Concentration of Risk
Number Of Suppliers	1	1
Percentage of concentration	10.90%	19.70%
Supplier Concentration Risk | Largest Supplier One | Purchased
Concentration of Risk
Percentage of concentration	21.10%	24.10%	26.60%
Geographic Concentration Risk | Revenue
Concentration of Risk
Percentage of concentration	100.00%	100.00%	100.00%
Franchised | Accounts Receivable
Concentration of Risk
Number of Franchisees	1	1
Franchised | Geographic Concentration Risk | Accounts Receivable
Concentration of Risk
Percentage of concentration	28.10%	28.40%
Greater Los Angeles area market | Geographic Concentration Risk | Revenue
Concentration of Risk
Percentage of concentration	71.90%	72.00%	71.30%