Income and Other Taxes (Unrecognized Gross Tax Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning of period	$ 419	$ 419
Adjustments based on tax positions related to the current year	0	0
Adjustments based on tax positions of prior years	0	0
End of period	$ 419	$ 419