Leases - Other Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 24, 2020	Sep. 30, 2021	Sep. 24, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Financing cash flows from finance leases	$ 736	$ 584	$ 2,065	$ 1,389
Operating cash flows from finance leases	234	263	724	794
Operating cash flows from operating leases	8,253	4,963	23,545	11,376
Right of use assets obtained in exchange for new lease obligations:
Finance lease liabilities		1,200		1,364
Operating lease liabilities	$ 287	$ 14	$ 1,862	$ 9,644