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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2016
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated entities	$ 3,850		$ 3,850		$ 10,470
Equity in income of unconsolidated entities	158	$ 62	213	$ 71
Unconsolidated Entities
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated entities	3,850		3,850		10,470
Total equity of unconsolidated entities	12,288		12,288		31,615
Total outstanding borrowings of unconsolidated entities	$ 16,624		$ 16,624		$ 14,702