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Derivatives Derivative Instruments Designated as Hedging Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability $ 470,769 $ 599,990
Derivative Assets 513,441 603,933
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge 8,000 4,200
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 37,598 2,248
Derivative, Notional Amount 1,300,000 784,400
Derivative Assets 23,154 2,523
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 6,058  
Derivative Assets 14,216 4,200
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 61 $ 130
Fair Value Hedging [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 420,000  
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 300,000