Leases - Supplemental cash flow and other information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 24, 2022	Sep. 25, 2021
Leases
Operating cash flows from operating leases	$ 3,042	$ 2,883
Operating cash flows from finance leases	397	399
Financing cash flows from finance leases	59	49
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 78	$ 1,638