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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
Income Taxes [Abstract]        
Favorable discrete items $ 0 $ 0 $ 0 $ 0
Income tax expense (benefit) $ (2,064) $ 5,143 $ 1,388 $ 9,236
Estimated annual effective income tax rate     33.00% 35.80%