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Derivatives And Risk Management (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
May 31, 2012
May 31, 2011
May 31, 2012
May 31, 2011
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Increase (reduction) in interest expense related to interest rate swaps $ 2.1 $ (3.9) $ (6.5) $ (10.7)
Notional amount of interest rate derivatives terminated 800      
Notional amount of foreign currency derivatives $ 323   $ 323  
Derivative, remaining maturity in months 12   12