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Leases Financial Statement Impact of Adopting ASC 842 (Details) - USD ($)
$ in Thousands
Sep. 26, 2020
Dec. 28, 2019
Dec. 30, 2018
Leases [Abstract]      
Operating lease right-of-use asset $ 45,186 $ 47,478 $ 52,800
Operating Lease, Liability $ 58,240   $ 67,300