Investments in Marketable Securities and Unconsolidated Entities - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended			15 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2015
Schedule of Equity Method Investments [Line Items]
Gain (Loss) on Sale of Investments	$ (500)			$ (1,800)
Settlement of Unconsolidated JV Debt Obligation	0	$ 0	$ 500
Impairment of unconsolidated entity investment	0	0	$ (181)
South Edge
Schedule of Equity Method Investments [Line Items]
Settlement of Unconsolidated JV Debt Obligation	3,300	$ 1,000
Joint Venture Obligation	$ 1,900			$ 1,900