RELATED PARTY TRANSACTIONS - Additional Information (Details) - El Pollo Loco Holdings, Inc	Dec. 28, 2022
Trimaran Pollo Partners, LLC
Related Party Transaction [Line Items]
Noncontrolling ownership percentage	30.30%
FS Equity Partners V, L.P
Related Party Transaction [Line Items]
Noncontrolling ownership percentage	14.80%
FS Affiliates V, L.P
Related Party Transaction [Line Items]
Noncontrolling ownership percentage	0.20%