Income and Other Taxes - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 54,000	$ (117,000)	$ 148,000	$ (2,000)
Effective tax rate on continuing operations	0.40%	5.00%	0.60%	1.10%
Interest and penalties accrued as tax liabilities	$ 0		$ 0		$ 0
Uncertain tax reserve, period increase (decrease)	$ 0		$ 0