Investments in Marketable Securities and Unconsolidated Entities - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2015
Schedule of Equity Method Investments [Line Items]
Gain (loss) on sale of investments	$ (1,800,000)					$ (500,000)
Change in unrealized loss related to available-for-sale securities		$ 0	$ 0	$ 0	$ 1,276,000
Impairment of unconsolidated entity investments		0	$ 0	0	$ 0
Financial Guarantee
Schedule of Equity Method Investments [Line Items]
Outstanding guarantees		0		0		0
Inspirada
Schedule of Equity Method Investments [Line Items]
Settlement of unconsolidated entity debt obligation						$ 3,300,000
Joint venture obligation		$ 1,100,000		$ 1,100,000