Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Current:
Federal	$ 9,902	$ 11,900	$ 16,077
State	4,583	5,019	6,237
Deferred
Federal	(843)	(2,563)	8,263
State	342	(618)	3,098
Income tax expense	$ 13,984	$ 13,738	$ 33,675