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Investments - Narrative (Details) (USD $) | 6 Months Ended |  | 6 Months Ended |  |  |
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Feb. 28, 2014 | Feb. 28, 2013 | Feb. 28, 2014 Horizon Milling, LLC [Member] | Feb. 28, 2014 Ventura Foods, LLC | Feb. 28, 2014 Energy [Member] National Cooperative Refinery Association [Member] | Feb. 28, 2013 Energy [Member] National Cooperative Refinery Association [Member] | Feb. 28, 2014 Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member] National Cooperative Refinery Association [Member] | Aug. 31, 2013 Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member] National Cooperative Refinery Association [Member] | Feb. 28, 2013 Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member] National Cooperative Refinery Association [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Payments for Repurchase of Redeemable Noncontrolling Interest | $ 65,981,000 | $ 65,981,000 |  |  | $ 66,000,000 | $ (66,000,000) |  |  |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest |  |  |  |  | 140,631,000 |  | 140,631,000 | 134,134,000 | 140,987,000
Ownership percentage |  |  | 24.00% | 50.00% |  |  |  |  |
Expected ownership of future joint venture | 0.00% |  |  |  |  |  |  |  |
Expected borrowings of future joint venture | 600,000,000 |  |  |  |  |  |  |  |
Equity value exceeding carrying value |  |  |  | $ 12,900,000 |  |  |  |  |

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