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Revenue from Contracts with Customers - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 27, 2020
Dec. 28, 2019
Revenue from Contract with Customer [Abstract]    
Trade receivables $ 208,795 $ 278,124
Contract assets (current) 686 857
Contract assets (long-term) 2,543 2,700
Contract liabilities $ 50,077 $ 54,972