Leases - Supplemental cash flow and other information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 25, 2022	Jun. 26, 2021
Leases
Operating cash flows from operating leases	$ 2,030	$ 1,891
Operating cash flows from finance leases	265	266
Financing cash flows from finance leases	47	$ 33
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 41