Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Current
Federal	$ 4,420	$ 6,088
State	935	493
Total	5,355	6,581
Deferred
Federal	(3,150)	1,606
State	573	120
Deferred income tax expense (benefit), total	(2,577)	1,726
Total	$ 2,778	$ 8,307