Income and Other Taxes (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income tax benefit (expense)	$ 55,000	$ (15,000)	$ 41,000	$ (30,000)
Effective tax rate on continuing operations	0.20%	(0.10%)	(0.10%)	0.10%
Interest and penalties accrued as tax liabilities	$ 500,000		$ 500,000		$ 500,000