Income and other Taxes (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income tax expense	$ 169,000	$ 8,000	$ 502,000	$ (112,000)
Income tax (expense) benefit, discontinued operations		$ 0	$ 0
Effective tax rate	(5.20%)	(0.40%)	13.70%	3.00%
Income tax penalties and interest accrued	$ 400,000		$ 400,000		$ 300,000