Goodwill and Other Intangible Assets - Classification of Amortization Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense in continuing operations	$ 5,780	$ 4,184	$ 4,742
Amortization expense in discontinued operations	0	0	2,055
Operations expense	199	90	87
Total expense from the amortization of definite-lived intangible assets	$ 5,979	$ 4,274	$ 6,884