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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 6 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance $ 43,693 $ 86,520 $ 75,982 $ 114,917
Balance 24,155 121,070 24,155 121,070
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 $ (19,538) $ 34,550 $ (51,827) $ 6,153