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REVENUES - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 28, 2019
Dec. 29, 2018
Sep. 29, 2018
Revenue from Contract with Customer [Abstract]      
Accounts receivable, net $ 302,582 $ 252,966 $ 318,071
Contract assets 3,429 2,841 2,372
Contract liabilities $ 2,514 $ 2,311 $ 3,446