Income Taxes - Components (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Current income tax expense:
Federal		$ (780)	$ 0	$ 0	$ 0
State		(229)	0	(232)	0
Total current income tax expense		(1,009)	0	(232)	0
Deferred income tax expense:
Federal		6,629	0	20,629	0
State		(2,375)	319	(3,444)	319
Total deferred income tax expense	$ 13,600	4,254	319	17,185	319
Total income tax expense		$ 3,245	$ 319	$ 16,953	$ 319