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Summary of Significant Accounting Policies Derivatives (Details) (USD $)
 3 Months Ended
Nov. 30, 2013
Aug. 31, 2013
Nov. 30, 2012
Purchase and Sales Contracts [Line Items]      
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months $ 1,200,000    
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet 42,186,000 54,067,000 46,579,000
Derivative Liability, Fair Value, Net 357,678,000 409,408,000 468,428,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet 42,186,000 54,067,000 46,579,000
Derivative Asset, Fair Value, Net 347,630,000 445,823,000 589,105,000
Derivative Asset, Fair Value, Gross Asset 390,084,000 499,890,000 635,684,000
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 268,000      
Derivative Liability, Fair Value, Gross Liability 407,238,000 465,066,000 525,094,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 7,374,000 1,591,000 10,087,000
Commodity and Freight Derivatives [Member]
      
Purchase and Sales Contracts [Line Items]      
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet 41,126,000 53,107,000 46,578,000
Derivative Liability, Fair Value, Net 356,846,000 404,195,000 461,712,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet 41,126,000 53,107,000 46,578,000
Derivative Asset, Fair Value, Net 323,060,000 415,566,000 585,966,000
Derivative Asset, Fair Value, Gross Asset 364,454,000 468,673,000 632,544,000
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 268,000      
Derivative Liability, Fair Value, Gross Liability 405,346,000 458,893,000 518,377,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 7,374,000 1,591,000 10,087,000
Foreign Exchange Contract [Member]
      
Purchase and Sales Contracts [Line Items]      
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet 1,060,000 957,000 1,000
Derivative Liability, Fair Value, Net 587,000 4,968,000 6,233,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet 1,060,000 957,000 1,000
Derivative Asset, Fair Value, Net 5,716,000 6,122,000 3,139,000
Derivative Asset, Fair Value, Gross Asset 6,776,000 7,079,000 3,140,000
Derivative Asset, Fair Value, Amount Not Offset Against Collateral         
Derivative Liability, Fair Value, Gross Liability 1,647,000 5,925,000 6,234,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral         
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
      
Purchase and Sales Contracts [Line Items]      
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet       
Derivative Asset, Fair Value, Net 18,854,000 24,135,000  
Derivative Asset, Fair Value, Gross Asset 18,854,000 24,135,000  
Derivative Asset, Fair Value, Amount Not Offset Against Collateral        
Not Designated as Hedging Instrument | Interest Rate Swap [Member]
      
Purchase and Sales Contracts [Line Items]      
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet    3,000   
Derivative Liability, Fair Value, Net 245,000 245,000 483,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet   3,000  
Derivative Asset, Fair Value, Net       
Derivative Asset, Fair Value, Gross Asset   3,000  
Derivative Asset, Fair Value, Amount Not Offset Against Collateral       
Derivative Liability, Fair Value, Gross Liability 245,000 248,000 483,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral