Leases Financial Statement Impact of Adopting ASC 842 (Details) - USD ($) $ in Thousands	Jun. 27, 2020	Dec. 28, 2019	Dec. 30, 2018
Leases [Abstract]
Operating lease right-of-use asset	$ 45,978	$ 47,478	$ 52,800
Operating Lease, Liability	$ 59,493		$ 67,300