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Earnings Per Share (Computation Of EPS) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Feb. 28, 2017
Feb. 27, 2016
Feb. 28, 2017
Feb. 27, 2016
Numerator for basic and diluted earnings per share:        
Net income (loss) $ (3,333) $ (448) $ (7,291) $ 342
Denominator for basic and diluted earnings per share:        
Basic weighted average shares outstanding 13,825 15,299 13,808 15,758
Effect of dilutive securities:        
Stock options and other stock-based awards       145
Diluted weighted average shares outstanding 13,825 15,299 13,808 15,903
EPS Calculations:        
Net income (loss) per share: Basic and diluted $ (0.24) $ (0.03) $ (0.53) $ 0.02