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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
Dec. 31, 2011
Sep. 30, 2011
Condensed Consolidated Balance Sheets [Abstract]    
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 2,000,000 2,000,000
Preferred stock, shares issued      
Preferred stock, shares outstanding      
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 60,000,000 60,000,000
Common stock, shares issued 29,115,604 29,100,577
Treasury stock, shares 3,438,598 3,471,930