Investments in Unconsolidated Entities - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Sep. 30, 2016
Equity Method Investments and Joint Ventures [Abstract]
Impairment of unconsolidated entity investments	$ 0	$ 0	$ 0	$ 0
Financial Guarantee
Schedule of Equity Method Investments [Line Items]
Outstanding guarantees					$ 0
Unconsolidated Entities | Financial Guarantee
Schedule of Equity Method Investments [Line Items]
Outstanding guarantees	$ 0		$ 0