Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Tax Cuts and Jobs Act of 2017, income tax expense	$ 3,200
Deferred tax asset, income tax expense	1,400
Tax Cuts and Jobs Act of 2017, transition tax for accumulated foreign earnings	4,600
Tax Cuts and Jobs Act of 2017, transition tax for accumulated foreign earnings, liability	56,700
Operating loss carryforwards	7,300
Management placed valuation allowance	$ 1,502	$ 1,320