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Acquisitions - National Cooperative Refinery Association Acquisition (Details) $ in Thousands | 3 Months Ended | 12 Months Ended | 37 Months Ended | 46 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 30, 2014 USD ($) | Nov. 30, 2013 USD ($) | Aug. 31, 2015 USD ($) | Aug. 31, 2014 USD ($) | Aug. 31, 2013 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) | Nov. 29, 2011 USD ($) Closings contingent_payments
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Current portion of mandatorily redeemable noncontrolling interest |  |  | $ 152,607 | $ 65,981 |  |  |  |
National Cooperative Refinery Association |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of voting interest acquired |  |  |  |  |  |  |  | 25.60%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage |  |  | 88.90% |  |  |  |  | 74.40%
National Cooperative Refinery Association | Accounts Payable and Accrued Liabilities [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest |  |  | $ 2,600 |  |  |  |  |
National Cooperative Refinery Association | Accrued liability for contingent crack spread payments related to purchase of noncontroling interests |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest |  |  | 76,000 | 114,900 |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  |  | (36,300) | (19,200) |  |  |  |
National Cooperative Refinery Association | Interest, Net |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Patronage earned by member |  |  | $ 31,000 | $ 65,500 | $ 142,400 |  |  |
National Cooperative Refinery Association | Growmark |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of voting interest acquired |  |  |  |  |  |  |  | 18.60%
Number of separate closings | Closings |  |  |  |  |  |  |  | 4
Business Combination, Step Acquisition, Future Payments Due, First Three Closings |  |  |  |  |  |  |  | $ 48,000
Aggregate base purchase price, amount paid at the final closing |  |  |  |  |  |  |  | $ 111,400
Number of purchase price payments | contingent_payments |  |  |  |  |  |  |  | 2
National Cooperative Refinery Association | MFA |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of voting interest acquired |  |  |  |  |  |  |  | 7.00%
Number of separate closings | Closings |  |  |  |  |  |  |  | 4
Business Combination, Step Acquisition, Future Payments Due, First Three Closings |  |  |  |  |  |  |  | $ 18,000
Aggregate base purchase price, amount paid at the final closing |  |  |  |  |  |  |  | $ 41,600
Number of purchase price payments | contingent_payments |  |  |  |  |  |  |  | 2
Crack Spread Contingent Payment [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Contingent Consideration, Potential Cash Payment | $ 0 | $ 16,500 |  |  |  |  |  |
Subsequent Event [Member] | National Cooperative Refinery Association |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage |  |  |  |  |  | 100.00% | 100.00% |
Subsequent Event [Member] | National Cooperative Refinery Association | Growmark |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Aggregate base purchase price |  |  |  |  |  | $ 255,500 |  |
Subsequent Event [Member] | National Cooperative Refinery Association | MFA |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Aggregate base purchase price |  |  |  |  |  |  | $ 95,500 |

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