Leases - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2021	Dec. 30, 2020	Dec. 25, 2019
Lessee, Lease, Description [Line Items]
Amortization of right-to-use assets	$ 80	$ 11	$ 9
Interest on lease liabilities	59	27	27
Operating Lease, Cost	27,623	27,805	27,485
Short-term Lease, Cost	21	23	34
Variable Lease, Cost	893	635	641
Sublease Income	(3,823)	(3,251)	(2,430)
Total lease cost	24,853	25,250	25,766
Operating Expense [Member]
Lessee, Lease, Description [Line Items]
Total lease cost	24,020	23,972	24,540
General and Administrative Expense
Lessee, Lease, Description [Line Items]
Total lease cost	414	464	463
Depreciation and amortization [Member]
Lessee, Lease, Description [Line Items]
Total lease cost	78	11	9
Interest Expense
Lessee, Lease, Description [Line Items]
Total lease cost	58	27	27
Restructuring Charges [Member]
Lessee, Lease, Description [Line Items]
Total lease cost	283	776	727
Property Lease [Member]
Lessee, Lease, Description [Line Items]
Amortization of right-to-use assets	78	11	9
Interest on lease liabilities	58	27	27
Operating Lease, Cost	26,501	26,578	26,212
Variable Lease, Cost	539	444	455
Sublease Income	(3,823)	(3,251)	(2,430)
Total lease cost	23,353	23,809	24,273
Equipment Lease [Member]
Lessee, Lease, Description [Line Items]
Amortization of right-to-use assets	2
Interest on lease liabilities	1
Operating Lease, Cost	1,122	1,227	1,273
Short-term Lease, Cost	21	23	34
Variable Lease, Cost	354	191	186
Total lease cost	$ 1,500	$ 1,441	$ 1,493