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Summary of Significant Accounting Policies Derivatives (Details) (USD $)
 3 Months Ended
Feb. 28, 2014
Aug. 31, 2013
Feb. 28, 2013
Feb. 28, 2014
Commodity and Freight Derivatives [Member]
Aug. 31, 2013
Commodity and Freight Derivatives [Member]
Feb. 28, 2013
Commodity and Freight Derivatives [Member]
Feb. 28, 2014
Foreign Exchange Contract [Member]
Aug. 31, 2013
Foreign Exchange Contract [Member]
Feb. 28, 2013
Foreign Exchange Contract [Member]
Aug. 31, 2013
Designated as Hedging Instrument [Member]
Interest Rate Swap [Member]
Feb. 28, 2013
Designated as Hedging Instrument [Member]
Interest Rate Swap [Member]
Feb. 28, 2014
Not Designated as Hedging Instrument [Member]
Interest Rate Swap [Member]
Aug. 31, 2013
Not Designated as Hedging Instrument [Member]
Interest Rate Swap [Member]
Feb. 28, 2013
Not Designated as Hedging Instrument [Member]
Interest Rate Swap [Member]
Feb. 28, 2014
Immaterial Balance Sheet Revision [Member]
Derivatives, Fair Value [Line Items]                              
Derivative Asset, Fair Value, Gross Asset $ 621,523,000 $ 499,890,000 $ 501,178,000 $ 615,178,000 $ 468,673,000 $ 485,222,000 $ 6,345,000 $ 7,079,000 $ 15,497,000 $ 24,135,000 $ 459,000   $ 3,000    
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 566,429,000 445,823,000 442,970,000 562,025,000 415,566,000 427,014,000 4,404,000 6,122,000 15,497,000 24,135,000 459,000         
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet 55,094,000 54,067,000 45,653,000 53,153,000 53,107,000 45,653,000 1,941,000 957,000           3,000    
Derivative Asset, Fair Value, Net 566,429,000 445,823,000 442,970,000 562,025,000 415,566,000 427,014,000 4,404,000 6,122,000 15,497,000 24,135,000 459,000         
Derivative Liability, Fair Value, Gross Liability 553,693,000 465,066,000 429,975,000 550,870,000 458,893,000 428,866,000 2,629,000 5,925,000 691,000     194,000 248,000 418,000  
Purchase and Sales Contracts [Line Items]                              
Quantifying Misstatement in Current Year Financial Statements, Amount                             212,700,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 472,271,000 409,408,000 375,455,000 471,389,000 404,195,000 374,346,000 688,000 4,968,000 691,000     194,000 245,000 418,000  
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet 55,093,000 54,067,000 45,653,000 53,152,000 53,107,000 45,653,000 1,941,000 957,000           3,000     
Derivative Liability, Fair Value, Net $ 472,271,000 $ 409,408,000 $ 375,455,000 $ 471,389,000 $ 404,195,000 $ 374,346,000 $ 688,000 $ 4,968,000 $ 691,000     $ 194,000 $ 245,000 $ 418,000