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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018
Equity Method Investments and Joint Ventures [Abstract]
Investment in unconsolidated entities	$ 3,941		$ 3,941		$ 4,035
Total equity of unconsolidated entities	3,553		3,553		10,113
Total outstanding borrowings of unconsolidated entities	13,229		13,229		$ 12,266
Equity in income of unconsolidated entities	$ 299	$ 147	$ 316	$ 302