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CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($)
$ in Thousands
May 31, 2016
Aug. 31, 2015
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 7,544 $ 9,033
Common stock, par value (in USD per share) $ 0.01 $ 0.01
Common stock, shares authorized 200,000,000 200,000,000
Common stock, shares issued 129,060,664 129,060,664
Common stock, shares outstanding 114,626,598 115,635,338
Treasury stock, shares 14,434,066 13,425,326