Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2011	Sep. 30, 2010
Stockholders' equity:
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	29,100,577	28,666,311
Treasury stock, shares	3,471,930	3,584,215