Income Taxes Income Taxes - Unrecognized Tax Benefits Table (Details) - USD ($)	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning of year	$ 0	$ 0	$ 1,600,000
Decrease for tax positions taken in prior years	0	0	(1,600,000)
Unrecognized tax benefits, end of year	0	0	0
Unrecognized Tax Benefits, Interest on Income Taxes Expense	0	$ 0	$ 0
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	$ 0