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Revenue from Contracts with Customers - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 28, 2019
Dec. 29, 2018
Revenue from Contract with Customer [Abstract]    
Trade receivables $ 275,738 $ 259,075
Contract assets (current) 837 529
Contract assets (long-term) 2,865 2,188
Contract liabilities $ 44,463 $ 44,858