LEASES - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2024	Mar. 29, 2023
Lessee, Lease, Description [Line Items]
Amortization of right-to-use assets	$ 19	$ 19
Interest on lease liabilities	15	11
Fixed rent cost	7,131	7,034
Short-term lease cost	1	3
Variable lease cost	480	375
Sublease income	(1,779)	(1,247)
Total lease cost	5,867	6,195
Occupancy and other operating expenses
Lessee, Lease, Description [Line Items]
Total lease cost	5,715	6,009
General & administrative
Lessee, Lease, Description [Line Items]
Total lease cost	118	136
Depreciation and amortization
Lessee, Lease, Description [Line Items]
Total lease cost	19	19
Interest expense
Lessee, Lease, Description [Line Items]
Total lease cost	15	11
Closed-store reserve
Lessee, Lease, Description [Line Items]
Total lease cost		20
Property Lease
Lessee, Lease, Description [Line Items]
Amortization of right-to-use assets	18	18
Interest on lease liabilities	11	10
Fixed rent cost	7,028	6,832
Variable lease cost	133	142
Sublease income	(1,779)	(1,247)
Total lease cost	5,411	5,755
Equipment Lease
Lessee, Lease, Description [Line Items]
Amortization of right-to-use assets	1	1
Interest on lease liabilities	4	1
Fixed rent cost	103	202
Short-term lease cost	1	3
Variable lease cost	347	233
Total lease cost	$ 456	$ 440