Income and Other Taxes - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Income tax expense	$ 29,000	$ 27,000	$ 177,000	$ 25,000
Effective tax rate on continuing operations	0.30%	0.40%	0.50%	0.30%
Interest and penalties accrued as tax liabilities	$ 0		$ 0		$ 0
Uncertain tax reserve, period increase (decrease)	$ 0		$ 0