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Income Taxes (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
May 31, 2013
Income Taxes [Abstract]  
Unrecognized tax benefits $ 2.0
Unrecognized tax benefits in interest and penalties 0.4
Decrease in unrecognized tax benefits 3.5
Decrease in unrecognized tax benefits impacting tax rate 0.1
Possible change in unrecognized tax benefits, lower bound 1.4
Possible change in unrecognized tax benefits, upper bound $ 2.5