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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2017
Feb. 29, 2016
Income Taxes [Abstract]        
Tax adjustment for unusual items $ 0 $ 0 $ 0 $ 0
Income tax expense (benefit) $ 2,624 $ (2,064) $ 3,086 $ 1,388
Estimated effective income tax rate     34.40% 33.00%