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ACQUISITIONS, DISPOSITIONS AND IMPAIRMENT CHARGES - Schedule of Property Acquisitions (Details)
2 Months Ended 12 Months Ended
Dec. 11, 2015
USD ($)
property_unit
Sep. 30, 2015
USD ($)
property_unit
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Real Estate Properties        
No. of Units | property_unit   8,300    
Property acquisition costs   $ 1,885,000 $ 2,542,000 $ 2,637,000
Joint ventures | Subsequent Event        
Real Estate Properties        
Debt face amount $ 19,500,000      
Purchase of properties | Multi-family residential | Primary Beneficiary | Joint ventures        
Real Estate Properties        
No. of Units | property_unit   1,506    
Contract purchase price   $ 129,425,000    
Amount contributed   34,951,000    
Property acquisition costs   1,885,000    
Purchase of properties | Multi-family residential | Primary Beneficiary | Joint ventures | Subsequent Event        
Real Estate Properties        
No. of Units | property_unit 507      
Contract purchase price $ 50,750,000      
Amount contributed 17,938,000      
Property acquisition costs 57,000,000      
Purchase of properties | Multi-family residential | Primary Beneficiary | Joint ventures | Mortgages        
Real Estate Properties        
Debt face amount   $ 91,278,000    
Purchase of properties | Multi-family residential | Primary Beneficiary | Joint ventures | Mortgages | Subsequent Event        
Real Estate Properties        
Debt face amount $ 16,052,000      
Purchase of properties | Multi-family residential | Pensacola, FL | Primary Beneficiary | Joint ventures        
Real Estate Properties        
No. of Units | property_unit   276    
Contract purchase price   $ 27,950,000    
Amount contributed   11,380,000    
Property acquisition costs   258,000    
Purchase of properties | Multi-family residential | Pensacola, FL | Primary Beneficiary | Joint ventures | Mortgages        
Real Estate Properties        
Debt face amount   $ 17,173,000    
Purchase of properties | Multi-family residential | Valley, AL | Primary Beneficiary | Joint ventures        
Real Estate Properties        
No. of Units | property_unit   618    
Contract purchase price   $ 43,750,000    
Amount contributed   10,351,000    
Property acquisition costs   629,000    
Purchase of properties | Multi-family residential | Valley, AL | Primary Beneficiary | Joint ventures | Mortgages        
Real Estate Properties        
Debt face amount   $ 28,990,000    
Purchase of properties | Multi-family residential | San Marco, TX | Primary Beneficiary | Joint ventures        
Real Estate Properties        
No. of Units | property_unit   192    
Contract purchase price   $ 21,725,000    
Amount contributed   4,720,000    
Property acquisition costs   535,000    
Purchase of properties | Multi-family residential | San Marco, TX | Primary Beneficiary | Joint ventures | Mortgages        
Real Estate Properties        
Debt face amount   $ 17,158,000    
Purchase of properties | Multi-family residential | Lake St. Louis, MO | Primary Beneficiary | Joint ventures        
Real Estate Properties        
No. of Units | property_unit   420    
Contract purchase price   $ 36,000,000    
Amount contributed   8,500,000    
Property acquisition costs   447,000    
Purchase of properties | Multi-family residential | Lake St. Louis, MO | Primary Beneficiary | Joint ventures | Mortgages        
Real Estate Properties        
Debt face amount   $ 27,957,000    
Purchase of properties | Multi-family residential | Other | Primary Beneficiary | Joint ventures        
Real Estate Properties        
No. of Units | property_unit   0    
Contract purchase price   $ 0    
Debt face amount   0    
Amount contributed   0    
Property acquisition costs   $ 16,000    
Purchase of properties | Multi-family residential | Charleston, SC | Primary Beneficiary | Joint ventures | Subsequent Event        
Real Estate Properties        
No. of Units | property_unit 271      
Contract purchase price $ 27,950,000      
Amount contributed 11,380,000      
Property acquisition costs 0      
Purchase of properties | Multi-family residential | Charleston, SC | Primary Beneficiary | Joint ventures | Mortgages | Subsequent Event        
Real Estate Properties        
Debt face amount $ 0      
Purchase of properties | Multi-family residential | LaGrange, GA | Primary Beneficiary | Joint ventures | Subsequent Event        
Real Estate Properties        
No. of Units | property_unit 236      
Contract purchase price $ 22,800,000      
Amount contributed 6,558,000      
Property acquisition costs 57,000,000      
Purchase of properties | Multi-family residential | LaGrange, GA | Primary Beneficiary | Joint ventures | Mortgages | Subsequent Event        
Real Estate Properties        
Debt face amount $ 16,052,000