REAL ESTATE PROPERTIES (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2015 USD ($)
Activity in real estate properties
Balance at the beginning of the period	$ 635,612
Additions	129,425
Capitalized Costs and Improvements	64,064
Sales	(51,394)
Depreciation, Amortization and other Reductions	(20,680)
Balance at the end of the period	757,027
Multi-family residential
Activity in real estate properties
Balance at the beginning of the period	511,866
Additions	129,425
Capitalized Costs and Improvements	33,399
Sales	(51,319)
Depreciation, Amortization and other Reductions	(18,331)
Balance at the end of the period	605,040
Commercial/mixed use properties | Primary Beneficiary | Newark Joint Venture
Activity in real estate properties
Balance at the beginning of the period	113,021
Additions	0
Capitalized Costs and Improvements	30,661
Sales	0
Depreciation, Amortization and other Reductions	(2,241)
Balance at the end of the period	141,441
Land
Activity in real estate properties
Balance at the beginning of the period	7,972
Additions	0
Capitalized Costs and Improvements	0
Sales	0
Depreciation, Amortization and other Reductions	0
Balance at the end of the period	7,972
Shopping centers/retail
Activity in real estate properties
Balance at the beginning of the period	2,678
Additions	0
Capitalized Costs and Improvements	4
Sales	0
Depreciation, Amortization and other Reductions	(108)
Balance at the end of the period	2,574
Co-op/Condo Apts
Activity in real estate properties
Balance at the beginning of the period	75
Additions	0
Capitalized Costs and Improvements	0
Sales	(75)
Depreciation, Amortization and other Reductions	0
Balance at the end of the period	$ 0