Income and Other Taxes - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income tax benefit (expense)	$ 117,000	$ (82,000)	$ 2,000	$ (208,000)
Effective tax rate on continuing operations	5.00%	1.80%	1.10%	2.90%
Uncertain tax benefit reserve	$ 0		$ 0		$ 0
Interest and penalties accrued as tax liabilities	0		0		$ 0
Uncertain tax reserve, period increase (decrease)	$ 0	$ 0	$ 0	$ 0