Prior Period Revision (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Other current assets	$ 4,249		$ 4,493
Total current assets	147,681		148,962
Deferred tax assets - non-current	7,383		6,151
Total assets	290,459		299,930
Retained earnings	117,816		116,065		110,260	102,645
Total stockholders' equity	265,298	273,010	274,243	272,239	270,834	260,693
Total liabilities and stockholders' equity	290,459		299,930
Restatement Adjustment
Retained earnings	(300)	300
Previously Reported
Other current assets			4,835
Total current assets			149,304
Deferred tax assets - non-current			5,832
Total assets			299,953
Retained earnings			116,088		110,283	102,668
Total stockholders' equity			274,266		270,857	260,716
Total liabilities and stockholders' equity			$ 299,953