Investments in Unconsolidated Entities - Outstanding Borrowings of Unconsolidated Entities and Equity in Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2017
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated entities	$ 4,237		$ 4,237		$ 3,994
Equity in income of unconsolidated entities	147	$ 158	302	$ 213
Unconsolidated Entities
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated entities	4,237		4,237		3,994
Total equity of unconsolidated entities	11,491		11,491		11,811
Total outstanding borrowings of unconsolidated entities	$ 15,234		$ 15,234		$ 15,797