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Inventories (Details) - USD ($)
$ in Thousands
Sep. 28, 2019
Dec. 29, 2018
Inventory Disclosure [Abstract]    
Finished product $ 199,764 $ 176,184
Work in process 80,313 78,501
Raw Material 35,852 32,502
Supplies and other 37,074 53,841
Inventories $ 353,003 $ 341,028