Investments in Unconsolidated Entities - Outstanding Borrowings of Unconsolidated Entities and Equity in Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2017
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated entities	$ 4,277		$ 3,994
Equity in (loss) income of unconsolidated entities	(101)	$ 22
Unconsolidated Entities
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated entities	4,277		3,994
Total equity of unconsolidated entities	10,152		11,811
Total outstanding borrowings of unconsolidated entities	$ 16,460		$ 15,797