LEASES - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 26, 2025	Mar. 27, 2024
Lessee, Lease, Description [Line Items]
Amortization of right-of-use assets	$ 49	$ 19
Interest on lease liabilities	14	15
Fixed rent cost	7,287	7,131
Short-term lease cost	28	1
Variable lease cost	473	480
Sublease income	(1,715)	(1,779)
Total lease cost	6,136	5,867
Occupancy and other operating expenses
Lessee, Lease, Description [Line Items]
Total lease cost	5,965	5,715
General & administrative
Lessee, Lease, Description [Line Items]
Total lease cost	108	118
Depreciation and amortization
Lessee, Lease, Description [Line Items]
Total lease cost	49	19
Interest expense
Lessee, Lease, Description [Line Items]
Total lease cost	14	15
Property Leases
Lessee, Lease, Description [Line Items]
Amortization of right-of-use assets	19	18
Interest on lease liabilities	9	11
Fixed rent cost	7,184	7,028
Variable lease cost	139	133
Sublease income	(1,715)	(1,779)
Total lease cost	5,636	5,411
Equipment Leases
Lessee, Lease, Description [Line Items]
Amortization of right-of-use assets	30	1
Interest on lease liabilities	5	4
Fixed rent cost	103	103
Short-term lease cost	28	1
Variable lease cost	334	347
Total lease cost	$ 500	$ 456