Common and Preferred Stock - Additional Information (Detail) (USD $)	1 Months Ended		12 Months Ended
	Jul. 31, 2012	Jul. 30, 2008	Sep. 30, 2013	Sep. 30, 2012
Repurchase of the Company’s outstanding common stock	$ 10,000,000	$ 7,000,000
Preferred stock, shares authorized			1,656,381	1,656,381
Preferred stock, par value			$ 0.01
Series B junior participating preferred stock, shares issued			0	0
Series B junior participating preferred stock, shares outstanding			0	0
Class of warrants rights preference share conversion ratio			0.10%
Series B Unit voting rights			One share of common stock
Series B junior participating preferred stock
Preferred stock, shares authorized			300,000	300,000
Preferred stock, par value			$ 0.01	$ 0.01
Series B junior participating preferred stock, shares outstanding