Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018
Income Tax Contingency [Line Items]
Income tax expense	$ 332	$ 420	$ 914	$ 1,572
Income tax benefit from discontinued operations		$ 3,200		$ 3,100
Unrecognized tax benefits that would impact effective tax rate	1,200		1,200		$ 1,200
Unrecognized tax benefits, income tax penalties and interest accrued	$ 700		$ 700		$ 700
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