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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
May. 31, 2015
Aug. 31, 2014
Statement Of Financial Position [Abstract]    
Trade and other accounts receivable, allowance for doubtful accounts $ 424 $ 406
Common stock, shares authorized 36,000,000 36,000,000
Common stock, par value $ 0.001 $ 0.001
Common stock, shares issued 19,527,923 19,464,310
Common stock, shares outstanding 14,481,172 14,754,362
Treasury stock, shares 5,046,751 4,709,948