Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Per Share data
May 31, 2011
Aug. 31, 2010
Condensed Consolidated Balance Sheets    
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 1,000 1,000
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 245,000 245,000
Common stock, shares issued 118,309 118,313
Treasury stock, shares 56,382 56,676