Income and Other Taxes (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income tax (expense) benefit	$ 14,000	$ 14,000	$ (27,000)	$ 44,000
Effective tax rate on continuing operations	0.00%	0.10%	0.00%	0.10%
Interest and penalties accrued as tax liabilities	$ 500,000		$ 500,000		$ 500,000