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Acquisitions - National Cooperative Refinery Association Acquisition (Details) (USD $) | 12 Months Ended |  |  |  | 12 Months Ended |  |  | 0 Months Ended | 12 Months Ended |  | 12 Months Ended |  |
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Aug. 31, 2013 | Aug. 31, 2013 Fair Value, Inputs, Level 3 Fair Value, Measurements, Recurring | Aug. 31, 2012 Fair Value, Inputs, Level 3 Fair Value, Measurements, Recurring | Aug. 31, 2013 Accrued liability for contingent crack spread payments related to purchase of noncontroling interests Fair Value, Inputs, Level 3 Fair Value, Measurements, Recurring | Aug. 31, 2013 Accrued liability for contingent crack spread payments related to purchase of noncontroling interests Cost of Goods, Total | Aug. 31, 2012 Accrued liability for contingent crack spread payments related to purchase of noncontroling interests Cost of Goods, Total | Aug. 31, 2013 National Cooperative Refinery Association | Aug. 31, 2012 National Cooperative Refinery Association | Sep. 03, 2013 National Cooperative Refinery Association | Nov. 29, 2011 National Cooperative Refinery Association | Nov. 29, 2011 National Cooperative Refinery Association Noncontrolling Interest | Nov. 29, 2011 National Cooperative Refinery Association Parent | Aug. 31, 2013 National Cooperative Refinery Association Accrued liability for contingent crack spread payments related to purchase of noncontroling interests | 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, 2013 National Cooperative Refinery Association Net Interest | Aug. 31, 2012 National Cooperative Refinery Association Net Interest | Nov. 29, 2011 National Cooperative Refinery Association Growmark contingent_payments Closings | Nov. 29, 2011 National Cooperative Refinery Association MFA contingent_payments Closings | Oct. 31, 2013 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 |  |  |  |  |  |  | 79.20% |  |  | 74.429% |  |  |  |  |  |  |  |  |  |
Business combination, step acquisition, first closing, equity interest in acquiree, percentage |  |  |  |  |  |  |  |  | 84.00% |  |  |  |  |  |  |  |  |  |  |
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 | 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 |  |  |  |  |  |  | 275,400,000 | 334,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Shares Subject To Mandatory Redemption, Interest Accretion |  |  |  |  |  |  | 6,700,000 | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Interest accretion |  |  |  |  | 23,109,000 | 22,328,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  | 134,134,000 | 127,516,000 | 134,134,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Contingent Consideration, at Fair Value |  |  |  |  |  |  |  |  |  |  |  |  | 150,600,000 | 127,500,000 | 105,200,000 |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  |  |  |  |  |  |  |  |  |  |  |  | 23,100,000 | 22,300,000 |  |  |  |  |  |
Business Acquisition, Contingent Consideration, Potential Cash Payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,500,000
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 142,400,000 | $ 107,200,000 |  |  |

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- Definition This element represents the acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 39, 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569655-111683 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4616395-111683 + Details
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