Income Tax Expense - Total Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Income Tax Expense
Income tax expense from continuing operations	$ 24,115	$ 17,175	$ 13,510
Income tax expense from discontinued operations	0		23,501
Total income tax expense (benefit)	$ 24,115	$ 17,175	$ 37,011