Effect of Impairment Charge Adjustment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Other assets, net	$ 3,145	$ 4,075
Total assets	107,593	104,319
Retained earnings	84,219	75,869
Total stockholders' equity	101,985	94,988
Total liabilities and stockholders' equity	107,593	104,319
As Reported
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
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
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