Real Estate Properties (Details) (USD $)	6 Months Ended						6 Months Ended
	Mar. 31, 2013	Mar. 31, 2013 Shopping centers/Retail	Mar. 31, 2013 Coop/Condo Apartments	Mar. 31, 2013 Commercial/Mixed Use Primary beneficiary Newark Joint Venture	Mar. 31, 2013 Commercial/Mixed Use Primary beneficiary Newark Joint Venture Mortgages Payable	Sep. 30, 2012 Commercial/Mixed Use Primary beneficiary Newark Joint Venture Mortgages Payable	Mar. 31, 2013 Multi-Family	Mar. 31, 2013 Land	Sep. 30, 2012 Land
Movement in real estate properties owned
Balance at the beginning of the period	$ 190,317,000	$ 2,749,000	$ 250,000	$ 61,808,000			$ 117,538,000	$ 7,972,000	$ 7,972,000
Additions	64,600,000						64,600,000
Costs Capitalized and Improvements	17,015,000			15,127,000			1,888,000
Depreciation, Amortization and Other Reductions	(2,918,000)	(52,000)	(24,000)	(305,000)			(2,537,000)
Balance at the end of the period	269,014,000	2,697,000	226,000	76,630,000			181,489,000	7,972,000	7,972,000
Blanket mortgage on assets					$ 20,100,000	$ 20,100,000