Income Taxes - Components (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Current income tax expense:
Federal	$ 0	$ 0
State	113	0
Total current income tax expense	113	0
Deferred income tax expense (benefit):
Federal	5,669	0
State	87	(515)
Total deferred income tax expense (benefit)	5,756	(515)
Total income tax expense (benefit)	$ 5,869	$ (515)