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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
May 31, 2014
May 31, 2013
May 31, 2014
May 31, 2013
Income Taxes [Abstract]        
Provision for income taxes 30.40% 30.60% 30.60% 30.60%
Unrecognized tax benefits affected by the resolution of tax examinations or expiring statutes of limitation $ 0.1   $ 0.1