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Inventories (Details) - USD ($)
$ in Thousands
Dec. 29, 2018
Dec. 30, 2017
Inventory Disclosure [Abstract]    
Finished product $ 176,184 $ 171,277
Work in process 78,501 101,540
Inventory, Raw Materials, Net of Reserves 32,502 33,173
Supplies and other 53,841 52,193
Inventories $ 341,028 $ 358,183