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Inventories - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Aug. 31, 2019
Aug. 31, 2018
Inventory Disclosure [Abstract]    
Grain and oilseed $ 1,024,645 $ 1,298,522
Energy 717,378 737,639
Agronomy 954,037 560,675
Processed grain and oilseed 109,900 99,426
Other 48,328 72,387
Total inventories $ 2,854,288 $ 2,768,649