Income Taxes - Schedule of Income Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
U.S.	$ (19,932)	$ 5,087	$ 33,549
Other than U.S.	3,013	12,706	(10,558)
Income (loss) before income taxes	$ (16,919)	$ 17,793	$ 22,991