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ACQUISITIONS, DISPOSITIONS AND IMPAIRMENT CHARGES - Schedule of Property Dispositions (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
property_unit
Jul. 24, 2015
USD ($)
property_unit
Jul. 07, 2015
USD ($)
property_unit
Feb. 05, 2015
USD ($)
property_unit
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 30, 2015
USD ($)
property_unit
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
No. of Units | property_unit 8,300               8,300    
Income from discontinued operations         $ 2 $ 185 $ 361 $ 852 $ 0 $ 1,400 $ 9,026
Discontinued Operations, Disposed of by Sale                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
No. of Units | property_unit 614               614    
Sales Price $ 67,783               $ 67,783    
Income from discontinued operations                 15,005    
Non-controlling partner portion of gain                 $ 5,089    
Discontinued Operations, Disposed of by Sale | Lawrenceville GA                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
No. of Units | property_unit       170              
Sales Price       $ 9,700              
Income from discontinued operations       2,655              
Non-controlling partner portion of gain       $ 1,141              
Discontinued Operations, Disposed of by Sale | Marietta GA                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
No. of Units | property_unit     207                
Sales Price     $ 17,600                
Income from discontinued operations     7,781                
Non-controlling partner portion of gain     $ 3,179                
Discontinued Operations, Disposed of by Sale | Houston TX                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
No. of Units | property_unit   236                  
Sales Price   $ 39,848                  
Income from discontinued operations   3,846                  
Non-controlling partner portion of gain   $ 769                  
Discontinued Operations, Disposed of by Sale | New York, NY                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
No. of Units | property_unit 1               1    
Sales Price $ 635               $ 635    
Income from discontinued operations 601                    
Non-controlling partner portion of gain $ 0                    
Discontinued Operations, Disposed of by Sale | Other                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
No. of Units | property_unit 0               0    
Sales Price $ 0               $ 0    
Income from discontinued operations                 122    
Non-controlling partner portion of gain                 $ 0