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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2015
May. 31, 2014
Income Taxes [Abstract]        
Provision for income taxes 30.20% 30.40% 30.10% 30.60%
Unrecognized tax benefits affected by the resolution of tax examinations or expiring statutes of limitation $ 0.4   $ 0.4