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Inventories (Details) - USD ($)
$ in Thousands
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Inventory Disclosure [Abstract]      
Raw materials and work-in-process $ 259,658 $ 278,038  
Finished goods 75,112 83,225  
Company-owned grain 0 10,155  
Inventory reserves (11,224) (9,461) $ (9,975)
Total Inventory, Net $ 323,546 $ 361,957