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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2017
Feb. 29, 2016
Income Taxes [Abstract]        
Provision for income taxes 32.80% 28.00% 30.70% 28.30%
Unrecognized tax benefits affected by the resolution of tax examinations or expiring statutes of limitation $ 0.3   $ 0.3  
Year under examination     2015