Income Taxes - Schedule of Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Current (benefit) expense:
U.S. Federal	$ (510)	$ 263	$ (1,570)
U.S. State	(143)	108	42
International	166	87	90
Total current (benefit) expense	(487)	458	(1,438)
Deferred expense (benefit):
U.S. Federal	5,200	1,851	(1,336)
U.S. State	515	(62)	197
International	(447)	(138)
Total deferred expense (benefit)	5,268	1,651	(1,139)
Total income tax expense (benefit)	$ 4,781	$ 2,109	$ (2,577)