Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Contingency [Line Items]
Income tax expense	$ 1,390	$ 986	$ (150)	$ 1,270
Reversal of accrued taxes, interest and penalties	3,100		3,100
Unrecognized tax benefits that would impact effective tax rate	1,200		1,200			$ 4,200
Unrecognized tax benefits, income tax penalties and interest accrued	$ 600		$ 600			$ 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
Scenario, Forecast
Income Tax Contingency [Line Items]
Statutory tax rate					24.50%