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Acquisitions - National Cooperative Refinery Association Acquisition (Details) (USD $) | 12 Months Ended |  |  | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 3 Months Ended |  | 37 Months Ended | 46 Months Ended | 3 Months Ended
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Aug. 31, 2012 | Aug. 31, 2014 | Aug. 31, 2013 | Nov. 29, 2011 National Cooperative Refinery Association | Aug. 31, 2014 National Cooperative Refinery Association | Aug. 31, 2013 National Cooperative Refinery Association | Nov. 29, 2011 National Cooperative Refinery Association Parent | Aug. 31, 2014 National Cooperative Refinery Association Accrued liability for contingent crack spread payments related to purchase of noncontroling interests | Aug. 31, 2013 National Cooperative Refinery Association Accrued liability for contingent crack spread payments related to purchase of noncontroling interests | Nov. 29, 2011 National Cooperative Refinery Association Accrued liability for contingent crack spread payments related to purchase of noncontroling interests | Aug. 31, 2014 National Cooperative Refinery Association Interest, Net | Aug. 31, 2013 National Cooperative Refinery Association Interest, Net | Nov. 29, 2011 National Cooperative Refinery Association Growmark contingent_payments Closings | Nov. 29, 2011 National Cooperative Refinery Association MFA contingent_payments Closings | Nov. 30, 2013 Crack Spread Contingent Payment [Member] | Sep. 30, 2014 Subsequent Event [Member] National Cooperative Refinery Association | Sep. 30, 2015 Subsequent Event [Member] National Cooperative Refinery Association Growmark | Sep. 30, 2015 Subsequent Event [Member] National Cooperative Refinery Association MFA | Nov. 30, 2014 Subsequent Event [Member] Crack Spread Contingent Payment [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interest acquired |  |  |  | 25.571% |  |  |  |  |  |  |  |  | 18.616% | 6.955% |  |  |  |  |
Percentage of voting interest, owned before transaction |  |  |  | 74.429% | 84.00% |  |  |  |  |  |  |  |  |  |  | 88.90% |  |  |
Number of separate closings |  |  |  |  |  |  |  |  |  |  |  |  | 4 | 4 |  |  |  |  |
Aggregate base purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 255,500,000 | $ 95,500,000 |
Business Combination, Step Acquisition, Future Payments Due, First Three Closings |  |  |  |  |  |  |  |  |  |  |  |  | 48,000,000 | 18,000,000 |  |  |  |  |
Aggregate base purchase price, amount paid at the second closing |  |  |  |  |  |  |  |  |  |  |  |  | 48,000,000 | 18,000,000 |  |  |  |  |
Aggregate base purchase price, amount paid at the third closing |  |  |  |  |  |  |  |  |  |  |  |  | 48,000,000 | 18,000,000 |  |  |  |  |
Aggregate base purchase price, amount paid at the final closing |  |  |  |  |  |  |  |  |  |  |  |  | 111,400,000 | 41,600,000 |  |  |  |  |
Number of purchase price payments |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 2 |  |  |  |  |
Current portion of mandatorily redeemable noncontrolling interest |  | 65,981,000 | 65,981,000 |  | 214,700,000 | 275,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Subject To Mandatory Redemption, Interest Accretion |  |  |  |  | 5,300,000 | 6,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of noncontrolling interests | 433,864,000 |  |  | 337,100,000 |  |  | 96,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest |  |  |  |  |  |  |  | 114,900,000 | 150,600,000 | 105,200,000 |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  |  |  |  |  |  |  | (19,200,000) | 23,100,000 |  |  |  |  |  |  |  |  |  |
Business Acquisition, Contingent Consideration, Potential Cash Payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,500,000 |  |  |  | 0
Patronage earned by member |  |  |  |  |  |  |  |  |  |  | $ 65,500,000 | $ 142,400,000 |  |  |  |  |  |  |

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