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Financial Derivatives (Schedule Of Derivative Instruments, Effect On Other Comprehensive Income (Loss)) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
May 31, 2012
May 31, 2011
May 31, 2012
May 31, 2011
Financial Derivatives [Abstract]        
Amount of Gain/(Loss) Recognized in OCI on Derivatives $ 1,313 [1] $ (173) [1] $ 2,008 [1] $ (823) [1]
Net of tax expense $ 802 $ 106 $ 1,225 $ 503
[1] Net of tax benefit of $802 and $1,225 for the three and nine months ended May 31, 2012, respectively. Net of tax benefit of $106 and $503 for the three and nine months ended May 31, 2011, respectively.