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Fair Value Measurements - Fair Value Reconciliation Liabilities Using Significant Unobservable Inputs (3 month) (Level 3) (Details) - National Cooperative Refinery Association [Member] - Crack Spread Contingent Payment [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 31, 2016
May 31, 2015
May 31, 2016
May 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance $ 24,155 $ 121,070 $ 75,982 $ 114,917
Balance 24,661 109,220 24,661 109,220
Cost of Goods, Total        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gains or losses included in cost of goods sold and net interest $ 506 $ (11,850) $ (51,321) $ (5,697)