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Derivatives Derivative Instruments Designated as Hedging Instruments (Details) (USD $)
Aug. 31, 2014
Aug. 31, 2013
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability $ 599,990,000 $ 465,066,000
Derivative Assets 603,933,000 499,890,000
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 4,200,000 24,135,000
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 130,000 248,000
Derivative Assets   3,000
Fair Value Hedging [Member] | Interest Rate Swap [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 260,000,000