Income Taxes - Schedule of Components of Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Current:
Federal	$ (7,782)	$ (1,395)	$ 2,638
State	(101)	449	699
Foreign	350	899	(306)
Current income tax provision	(7,533)	(47)	3,031
Deferred:
Federal	392	1,923	3,296
State	(515)	47	420
Foreign	223	360	6,805
Deferred income tax provision	100	2,330	10,521
Total income tax provision (benefit)	$ (7,433)	$ 2,283	$ 13,552