Income Taxes - Schedule of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Current
Federal		$ (39)
State	$ 231	202	$ 297
Total current income tax provision	231	163	297
Deferred
Federal	(47,879)	4,494	8,404
State	(4,342)	1,171	830
Total deferred income tax provision	(52,221)	5,665	9,234
(Benefit) provision for income taxes	$ (51,990)	$ 5,828	$ 9,531

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