Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Tax Contingency [Line Items]
Statutory tax rate based on blended rate calculation		24.50%
(Reductions) additions to valuation allowance	$ (839)	$ 1,380
Operating loss carryforwards, annual utilization limits	800
Unrecognized tax benefits that would impact effective tax rate	600
Unrecognized tax benefits, income tax penalties and interest expense	(2,000)	400	$ 400
Unrecognized tax benefits, income tax penalties and interest accrued	$ 700	$ 2,600
Minimum
Income Tax Contingency [Line Items]
Number of years open for tax examinations	3 years
Maximum
Income Tax Contingency [Line Items]
Number of years open for tax examinations	5 years
Federal
Income Tax Contingency [Line Items]
Net operating loss carryforwards	$ 14,000
Foreign Tax Authority
Income Tax Contingency [Line Items]
Net operating loss carryforwards	53,000
State Jurisdiction
Income Tax Contingency [Line Items]
Net operating loss carryforwards	$ 3,600