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Notes Payable and Long-Term Debt - Schedule of Interest, Net (Details) - USD ($)
$ in Thousands
3 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Debt Disclosure [Abstract]    
Interest Expense $ 22,710 $ 22,340
Interest-purchase of CHS McPherson noncontrolling interest 0 14,068
Capitalized interest (13,659) (11,905)
Interest income (2,058) (2,598)
Interest expense, net $ 6,993 $ 21,905