Immaterial Restatement - Effect of Impairment Charge Adjustment (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Sep. 30, 2012
Other assets, net	$ 3,145	$ 4,075
Total assets	103,926	104,319
Retained earnings	87,350	75,869
Total stockholders' equity	98,039	94,988
Total liabilities and stockholders' equity	103,926	104,319
As Reported [Member]
Other assets, net		2,831
Total assets		103,075
Retained earnings		74,625
Total stockholders' equity		93,744
Total liabilities and stockholders' equity		103,075
Adjustment [Member]
Other assets, net		1,244
Total assets		1,244
Retained earnings		1,244
Total stockholders' equity		1,244
Total liabilities and stockholders' equity		1,244
As Restated [Member]
Other assets, net		4,075
Total assets		104,319
Retained earnings		75,869
Total stockholders' equity		94,988
Total liabilities and stockholders' equity		$ 104,319