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Acquisitions - National Cooperative Refinery Association Acquisition (Details) (USD $) | 12 Months Ended |  | 12 Months Ended | 3 Months Ended | 9 Months Ended |  |  | 0 Months Ended | 9 Months Ended |  | 12 Months Ended |  |
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Aug. 31, 2012 | Aug. 31, 2012 Fair Value, Inputs, Level 3 Fair Value, Measurements, Recurring | Aug. 31, 2012 Accrued liability for contingent crack spread payments related to purchase of noncontroling interests Fair Value, Inputs, Level 3 Fair Value, Measurements, Recurring | Aug. 31, 2012 Accrued liability for contingent crack spread payments related to purchase of noncontroling interests Cost of Goods, Total | Aug. 31, 2012 Mandatorily redeemable noncontrolling interests Net Interest | Aug. 31, 2012 National Cooperative Refinery Association | Nov. 29, 2011 National Cooperative Refinery Association | Nov. 28, 2011 National Cooperative Refinery Association | Nov. 29, 2011 National Cooperative Refinery Association Noncontrolling Interest | Nov. 29, 2011 National Cooperative Refinery Association Parent | Aug. 31, 2012 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, 2012 National Cooperative Refinery Association Net Interest | Nov. 30, 2011 National Cooperative Refinery Association Growmark | Nov. 29, 2011 National Cooperative Refinery Association Growmark Closings contingent_payments | Nov. 29, 2011 National Cooperative Refinery Association MFA Closings contingent_payments
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interest acquired |  |  |  |  |  |  | 25.571% |  |  |  |  |  |  |  | 18.616% | 6.955%
Percentage of voting interest, owned before transaction |  |  |  |  |  |  |  | 74.429% |  |  |  |  |  |  |  |
Business combination, step acquisition, first closing, equity interest in acquiree, percentage |  |  |  |  |  | 79.20% |  |  |  |  |  |  |  |  |  |
Number of separate closings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 | 4
Aggregate base purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 255,500,000 | $ 95,500,000
Aggregate base purchase price, amount paid at the first closing |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,000,000 |  | 18,000,000
Aggregate base purchase price, amount paid at the second closing |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,000,000 | 95,500,000
Aggregate base purchase price, amount paid at the third closing |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,000,000 | 95,500,000
Aggregate base purchase price, amount paid at the final closing |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 111,400,000 | 41,600,000
Number of purchase price payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 2
Shares subject to mandatory redemption settlement terms amount |  |  |  |  |  | 334,700,000 |  |  |  |  |  |  |  |  |  |
Shares Subject To Mandatory Redemption, Interest Accretion |  |  |  |  |  | 6,000,000 |  |  |  |  |  |  |  |  |  |
Interest accretion |  |  |  | 22,328,000 | (6,031,000) |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interests reclassified to a liability | 433,864,000 |  |  |  |  |  |  |  | 337,100,000 | 96,700,000 |  |  |  |  |  |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest |  | 127,516,000 | 127,516,000 |  |  |  |  |  |  |  | 127,500,000 | 105,200,000 |  |  |  |
Contingent Liability, Change in Fair Value |  |  |  |  |  |  |  |  |  |  | 22,300,000 |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 107,200,000 |  |  |

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