Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Current:
Federal	$ 11,964	$ 9,902	$ 11,900
State	5,356	4,583	5,019
Deferred
Federal	(2,719)	(843)	(2,563)
State	(1,270)	342	(618)
Income tax expense	$ 13,331	$ 13,984	$ 13,738