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Inventories (Tables)
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
June 30, 2018December 30, 2017
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Raw materials and work-in-process277,818262,527
Finished goods103,14692,489
Company-owned grain10,2169,937
Inventory reserves(8,249)(9,975)
382,931354,978