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Inventories (Details) - USD ($)
$ in Thousands
Sep. 29, 2018
Dec. 30, 2017
Inventory Disclosure [Abstract]    
Finished product $ 184,989 $ 171,277
Work in process 88,073 101,540
Raw Material 36,050 33,173
Supplies and other 52,567 52,193
Inventories $ 361,679 $ 358,183