Income and other Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income tax benefit	$ 19	$ 175	$ 131	$ 22
Income tax expense, discontinued operations	$ 0	$ 200	$ 0	$ (33)
Effective tax rate	0.80%	12.90%	2.10%	2.40%
Income tax penalties and interest accrued	$ 300		$ 300		$ 300