Leases - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2020	Dec. 25, 2019	Dec. 26, 2018
Lessee, Lease, Description [Line Items]
Amortization of right-to-use assets	$ 11	$ 9
Interest on lease liabilities	27	27
Operating Lease, Cost	27,805	27,485
Short-term Lease, Cost	23	34
Variable Lease, Cost	635	641
Sublease Income	(3,251)	(2,430)
Total lease cost	25,250	25,766
Rent expense			$ 23,700
Sublease income			$ 2,200
Occupancy and Other Operating Expenses
Lessee, Lease, Description [Line Items]
Total lease cost	23,972	24,540
General and Administrative Expense
Lessee, Lease, Description [Line Items]
Total lease cost	464	463
Depreciation and amortization
Lessee, Lease, Description [Line Items]
Total lease cost	11	9
Interest Expense
Lessee, Lease, Description [Line Items]
Total lease cost	27	27
Closed-store reserve
Lessee, Lease, Description [Line Items]
Total lease cost	776	727
Property Lease [Member]
Lessee, Lease, Description [Line Items]
Amortization of right-to-use assets	11	9
Interest on lease liabilities	27	27
Operating Lease, Cost	26,578	26,212
Variable Lease, Cost	444	455
Sublease Income	(3,251)	(2,430)
Total lease cost	23,809	24,273
Equipment Lease [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Cost	1,227	1,273
Short-term Lease, Cost	23	34
Variable Lease, Cost	191	186
Total lease cost	$ 1,441	$ 1,493