Income Taxes - Schedule of Income Taxes from Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Current provision:
Federal	$ 6,065	$ 6,470	$ 6,048
State and foreign	136	147	225
Total current provision	6,201	6,617	6,273
Deferred provision (benefit):
Federal	58	(347)	(552)
State	35	(5)	60
Total deferred provision (benefit)	93	(352)	(492)
Income tax provision	$ 6,294	$ 6,265	$ 5,781