Goodwill and Intangible Assets - Changes in Net Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Goodwill [Roll Forward]
Balance at beginning of period	$ 16,480	$ 7,658
Goodwill acquired during the year		8,760
Goodwill adjustment	(589)
Currency translation	21	62
Impairment adjustment	(4,164)	0
Balance at end of period	$ 11,748	$ 16,480