Income and other Taxes (Unrecognized Gross Tax Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Unrecognized Gross Tax Benefit
Beginning balance	$ 288	$ 413
Adjustments based on tax positions related to the current year	131	0
Adjustments based on tax positions of prior years	0	(125)
Ending balance	$ 419	$ 288