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Inventories (Details) - USD ($)
$ in Thousands
Mar. 30, 2019
Dec. 29, 2018
Inventory Disclosure [Abstract]    
Finished product $ 176,451 $ 176,184
Work in process 81,242 78,501
Raw Material 27,723 32,502
Supplies and other 54,466 53,841
Inventories $ 339,882 $ 341,028