Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Income tax provision	$ 148	$ 1,155	$ 913	$ 1,536
Income tax benefit specific to the period			100	$ 700
Unrecognized tax benefits that would impact effective tax rate	1,400		1,400
Decrease in unrecognized tax benefits that is reasonably possible	$ 700		$ 700