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Earnings (Loss) Per Share (Computation Of EPS) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Numerator for basic and diluted earnings per share:      
Net income (loss) $ (7,172) $ 7,016 $ 11,116
Denominator for basic and diluted earnings per share:      
Basic weighted average shares outstanding 13,819 14,944 16,742
Effect of dilutive securities:      
Stock options and other stock-based awards   132 181
Diluted weighted average shares outstanding 13,819 15,076 16,923
EPS Calculations:      
Net income (loss) per share: Basic $ (0.52) $ 0.47 $ 0.66
Net income (loss) per share: Diluted $ (0.52) $ 0.47 $ 0.66