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Fair Value Measurements - Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Feb. 28, 2014 | Aug. 31, 2013 | Feb. 28, 2013
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 621,523 | $ 499,890 | $ 501,178
Derivative Liability, Fair Value, Gross Liability | 553,693 | 465,066 | 429,975
Fair Value, Measurements, Recurring [Member] | 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 |  |  |
Other Assets, Fair Value Disclosure | 114,261 | 114,084 | 79,333
Total assets | 178,244 | 179,419 | 133,157
Total liabilities | 93,618 | 65,109 | 21,775
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Inventory, Current, Fair Value Disclosure | 1,318,428 | 1,203,383 | 1,697,214
Other Assets, Fair Value Disclosure |  |  |
Total assets | 1,875,968 | 1,637,940 | 2,144,568
Total liabilities | 460,075 | 399,958 | 408,200
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Inventory, Current, Fair Value Disclosure |  |  |
Other Assets, Fair Value Disclosure |  |  |
Total assets |  |  |
Total liabilities | 140,631 | 134,134 | 140,987
Fair Value, Measurements, Recurring [Member] | 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 | 1,318,428 | 1,203,383 | 1,697,214
Other Assets, Fair Value Disclosure | 114,261 | 114,084 | 79,333
Total assets | 2,054,212 | 1,817,359 | 2,277,725
Total liabilities | 694,324 | 599,201 | 570,962
Foreign Exchange Contract [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | 6,345 | 7,079 | 15,497
Derivative Liability, Fair Value, Gross Liability | 2,629 | 5,925 | 691
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | 6,345 | 6,894 | 15,497
Derivative Liability, Fair Value, Gross Liability | 2,629 | 5,925 | 691
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 185 |
Derivative Liability, Fair Value, Gross Liability |  |  |
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  |  |
Derivative Liability, Fair Value, Gross Liability |  |  |
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | 6,345 | 7,079 | 15,497
Derivative Liability, Fair Value, Gross Liability | 2,629 | 5,925 | 691
Commodity and Freight Derivatives [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | 615,178 | 468,673 | 485,222
Derivative Liability, Fair Value, Gross Liability | 550,870 | 458,893 | 428,866
Commodity and Freight Derivatives [Member] | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | 57,638 | 58,441 | 38,327
Derivative Liability, Fair Value, Gross Liability | 90,989 | 59,184 | 21,084
Commodity and Freight Derivatives [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | 557,540 | 410,233 | 446,895
Derivative Liability, Fair Value, Gross Liability | 459,881 | 399,710 | 407,782
Commodity and Freight Derivatives [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  |  |
Derivative Liability, Fair Value, Gross Liability |  |  |
Commodity and Freight Derivatives [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | 615,178 | 468,674 | 485,222
Derivative Liability, Fair Value, Gross Liability | 550,870 | 458,894 | 428,866
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  |  |
Derivative Liability, Fair Value, Gross Liability |  |  |
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 24,139 | 459
Derivative Liability, Fair Value, Gross Liability | 194 | 248 | 418
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  |  |
Derivative Liability, Fair Value, Gross Liability |  |  |
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 24,139 | 459
Derivative Liability, Fair Value, Gross Liability | 194 | 248 | 418
National Cooperative Refinery Association [Member] | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest |  |  |
National Cooperative Refinery Association [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest |  |  |
National Cooperative Refinery Association [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest | 140,631 | 134,134 | 140,987
National Cooperative Refinery Association [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest |  | $ 134,134 | $ 140,987

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