Stockholders' Equity - Additional Information (Detail) (USD $)	Sep. 30, 2011	Sep. 30, 2010
Stockholders Equity Note [Line Items]
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, share issued	0	0
Preferred stock, shares outstanding	0	0