Inventories - Schedule of Inventories (Details) - USD ($) $ in Thousands	May. 31, 2015	Aug. 31, 2014
Inventory Disclosure [Abstract]
Grain and Oilseed	$ 1,288,769	$ 961,327
Energy	864,370	875,719
Crop nutrients	298,933	374,023
Feed and farm supplies	582,900	448,454
Processed grain and oilseed	73,381	84,498
Other	10,485	16,232
Inventories	$ 3,118,838	$ 2,760,253