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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 30, 2017
Inventory Disclosure [Abstract]    
Raw materials and work-in-process $ 277,818 $ 262,527
Finished goods 103,146 92,489
Company-owned grain 10,216 9,937
Inventory reserves (8,249) (9,975)
Total Inventory, Net $ 382,931 $ 354,978