Goodwill and Other Intangible Assets - Classification of Amortization Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense in continuing operations	$ 4,184	$ 4,742	$ 3,875
Amortization expense in discontinued operations	0	2,055	2,397
Operations expense	90	87	103
Total expense from the amortization of definite-lived intangible assets	$ 4,274	$ 6,884	$ 6,375