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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Aug. 31, 2014
Aug. 31, 2013
Statement Of Financial Position [Abstract]    
Trade accounts receivable, allowance for doubtful accounts $ 406 $ 540
Common stock, shares authorized 36,000,000 36,000,000
Common stock, par value $ 0.001 $ 0.001
Common stock, shares issued 19,464,310 19,392,979
Common stock, shares outstanding 14,754,362 15,285,536
Treasury stock, shares 4,709,948 4,107,443