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Fair Value Measurements Recurring Fair Value Measurements by Level (Details) (USD $)
In Thousands, unless otherwise specified
May 31, 2014
Aug. 31, 2013
May 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Asset, Fair Value, Gross Asset $ 544,382 $ 499,890 $ 524,461
Derivative Liability, Fair Value, Gross Liability 412,471 465,066 456,476
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Inventory, Current, Fair Value Disclosure 0 0 0
Other Assets, Fair Value Disclosure 89,848 114,084 131,901
Assets, Fair Value Disclosure 176,669 179,419 190,319
Liabilities, Fair Value Disclosure 81,437 65,109 99,880
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Inventory, Current, Fair Value Disclosure 1,159,581 1,203,383 1,433,639
Other Assets, Fair Value Disclosure 0 0 0
Assets, Fair Value Disclosure 1,617,142 1,637,940 1,899,682
Liabilities, Fair Value Disclosure 331,034 399,958 356,596
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Inventory, Current, Fair Value Disclosure 0 0 0
Other Assets, Fair Value Disclosure 0 0 0
Assets, Fair Value Disclosure 0 0 0
Liabilities, Fair Value Disclosure 130,159 134,134 146,245
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Inventory, Current, Fair Value Disclosure 1,159,581 1,203,383 1,433,639
Other Assets, Fair Value Disclosure 89,848 114,084 131,901
Assets, Fair Value Disclosure 1,793,811 1,817,359 2,090,001
Liabilities, Fair Value Disclosure 542,630 599,201 602,721
Commodity and Freight Derivatives [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Asset, Fair Value, Gross Asset 544,198 468,673 510,258
Derivative Liability, Fair Value, Gross Liability 410,148 458,893 452,289
Commodity and Freight Derivatives [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Asset, Fair Value, Gross Asset 86,639 58,441 53,375
Derivative Liability, Fair Value, Gross Liability 79,284 59,184 95,997
Commodity and Freight Derivatives [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Asset, Fair Value, Gross Asset 457,559 410,233 456,883
Derivative Liability, Fair Value, Gross Liability 330,864 399,710 356,292
Commodity and Freight Derivatives [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Asset, Fair Value, Gross Asset 0 0 0
Derivative Liability, Fair Value, Gross Liability 0 0 0
Commodity and Freight Derivatives [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Asset, Fair Value, Gross Asset 544,198 468,674 510,258
Derivative Liability, Fair Value, Gross Liability 410,148 458,894 452,289
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Asset, Fair Value, Gross Asset 0 0 0
Derivative Liability, Fair Value, Gross Liability 0 0 0
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Asset, Fair Value, Gross Asset 2 24,139 9,160
Derivative Liability, Fair Value, Gross Liability 170 248 304
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Asset, Fair Value, Gross Asset 0 0 0
Derivative Liability, Fair Value, Gross Liability 0 0 0
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Asset, Fair Value, Gross Asset 2 24,139 9,160
Derivative Liability, Fair Value, Gross Liability 170 248 304
Foreign Exchange Contract [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Asset, Fair Value, Gross Asset 182 7,079 5,043
Derivative Liability, Fair Value, Gross Liability 2,153 5,925 3,883
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Asset, Fair Value, Gross Asset 182 6,894 5,043
Derivative Liability, Fair Value, Gross Liability 2,153 5,925 3,883
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Asset, Fair Value, Gross Asset 0 185 0
Derivative Liability, Fair Value, Gross Liability 0 0 0
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Asset, Fair Value, Gross Asset 0 0 0
Derivative Liability, Fair Value, Gross Liability 0 0 0
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Asset, Fair Value, Gross Asset 182 7,079 5,043
Derivative Liability, Fair Value, Gross Liability $ 2,153 $ 5,925 $ 3,883