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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 31, 2017
May 31, 2016
May 31, 2017
May 31, 2016
Income Taxes [Abstract]        
Tax adjustment for unusual items $ 0 $ 0 $ 0 $ 0
Income tax expense $ 5,245 $ 4,421 $ 8,331 $ 5,809
Estimated effective income tax rate     33.10% 31.80%