Leases - Other Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 26, 2019	Dec. 27, 2018
Cash paid for amounts included in the measurement of lease liabilities:
Financing cash flows from finance leases	$ 2,007	$ 2,544	$ 1,836
Operating cash flows from finance leases	1,048	1,247
Operating cash flows from operating leases	17,685	25,266
Right of use assets obtained in exchange for new lease obligations:
Finance lease liabilities	1,417	1,726
Operating lease liabilities, including from acquisitions	$ 10,957	$ 180,103