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Investments - Narrative (Details) (USD $) | 9 Months Ended | 3 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  |  |
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May 31, 2014 | May 31, 2013 | May 31, 2014 Ardent Mills [Member] | May 31, 2014 Horizon Milling, LLC [Member] | May 31, 2014 Ventura Foods, LLC | May 31, 2014 National Cooperative Refinery Association [Member] | Aug. 31, 2013 National Cooperative Refinery Association [Member] | May 31, 2014 Energy [Member] National Cooperative Refinery Association [Member] | May 31, 2013 Energy [Member] National Cooperative Refinery Association [Member] | May 31, 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] | May 31, 2013 Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member] National Cooperative Refinery Association [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage |  |  |  |  |  | 84.00% | 79.20% |  |  |  |  |
Payments to Acquire Business, Contingent Consideration Paid |  |  |  |  |  | $ (16,500,000) |  |  |  |  |  |
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 |  |  |  |  |  |  |  | 130,159,000 |  | 130,159,000 | 134,134,000 | 146,245,000
Ownership percentage |  |  |  |  | 50.00% |  |  |  |  |  |  |
Equity Method Investment, Additional Cash Contribution |  |  |  | 32,800,000 |  |  |  |  |  |  |  |
Investments redeemed |  |  | 123,500,000 |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Investments |  |  |  | 108,800,000 |  |  |  |  |  |  |  |
Equity value exceeding carrying value |  |  |  |  | $ 12,900,000 |  |  |  |  |  |  |

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