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Fair Value Measurements - Fair Value Measurements (Details) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified | Aug. 31, 2013 | Aug. 31, 2012
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Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Inventory, Current, Fair Value Disclosure |  |
Foreign currency derivatives | 6,894 | 978
Other assets | 114,084 | 75,000
Total assets | 179,419 | 197,991
Foreign currency derivatives | 5,925 | 2,388
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest |  |
Total liabilities | 65,109 | 203,863
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commodity and feight derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Commodity and Freight Derivatives At Fair Value | 58,441 | 122,013
Derivative liabilities | 59,184 | 201,475
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Inventory, Current, Fair Value Disclosure | 1,203,383 | 1,702,757
Foreign currency derivatives | 185 |
Other assets |  |
Total assets | 1,637,940 | 2,651,544
Foreign currency derivatives |  |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest |  |
Total liabilities | 399,958 | 645,996
Significant Other Observable Inputs (Level 2) | Commodity and feight derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Commodity and Freight Derivatives At Fair Value | 410,233 | 948,787
Derivative liabilities | 399,710 | 645,452
Significant Other Observable Inputs (Level 2) | Interest Rate Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest Rate Derivative Assets, at Fair Value | 24,139 |
Interest Rate Derivative Liabilities, at Fair Value | 248 | 544
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Inventory, Current, Fair Value Disclosure |  |
Foreign currency derivatives |  |
Other assets |  |
Total assets |  |
Foreign currency derivatives |  |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest | 134,134 | 127,516
Total liabilities | 134,134 | 127,516
Significant Unobservable Inputs (Level 3) | Commodity and feight derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Commodity and Freight Derivatives At Fair Value |  |
Derivative liabilities |  |
Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Inventory, Current, Fair Value Disclosure | 1,203,383 | 1,702,757
Foreign currency derivatives | 7,079 | 978
Other assets | 114,084 | 75,000
Total assets | 1,817,359 | 2,849,535
Foreign currency derivatives | 5,925 | 2,388
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest | 134,134 | 127,516
Total liabilities | 599,201 | 977,375
Estimate of Fair Value, Fair Value Disclosure [Member] | Commodity and feight derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Commodity and Freight Derivatives At Fair Value | 468,674 | 1,070,800
Derivative liabilities | 458,894 | 846,927
Estimate of Fair Value, Fair Value Disclosure [Member] | Interest Rate Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest Rate Derivative Assets, at Fair Value | 24,139 |
Interest Rate Derivative Liabilities, at Fair Value | $ 248 | $ 544

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents contracts related to the exchange of different currencies, including foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into and existing as of the balance sheet date. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -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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