Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Jun. 30, 2011	Sep. 30, 2010
Stockholders' equity:
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, share authorized	2,000,000	2,000,000
Preferred stock, share issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, share authorized	60,000,000	60,000,000
Common stock, share issued	28,947,903	28,666,311
Treasury stock, shares	3,497,375	3,584,215