Income Taxes - Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Income (loss) before income taxes:
U.S.	$ (4,160)	$ 36,327	$ (360)
Foreign	7,911	10,849	5,480
Income before income taxes	3,751	47,176	5,120
Current:
U.S. Federal	(4,427)	11,207	427
Foreign	1,368	1,690	1,012
State	(141)	686	541
Total	(3,200)	13,583	1,980
Deferred:
U.S. Federal	4,582	(79)	(983)
Foreign	(105)	690	302
State	(2,954)	2,368	70
Valuation allowance	408	128
Total	1,931	3,107	(611)
Total provision for income taxes	$ (1,269)	$ 16,690	$ 1,369