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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 6 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Feb. 29, 2012
Feb. 28, 2011
Financial Derivatives [Abstract]        
Amount of Gain/(Loss) Recognized in OCI on Derivatives $ 104 [1] $ (219) [1] $ 695 [1] $ (649) [1]
Net of tax expense $ 63 $ 134 $ 423 $ 397
[1] Net of tax expense of $63 and $423 for the three and six months ended February 29, 2012. Net of tax benefit of $134 and $397 for the three and six months ended February 28, 2011.