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INVESTMENT IN UNCONSOLIDATED VENTURES (Details)
12 Months Ended
Sep. 30, 2017
USD ($)
property
property_unit
investment
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Schedule of Equity Method Investments [Line Items]      
Number of investments | investment 3    
Contributions to unconsolidated joint ventures $ 21,894,000 $ 0 $ 0
Number of properties owned | property 33    
Unconsolidated joint ventures      
Schedule of Equity Method Investments [Line Items]      
Contributions to unconsolidated joint ventures $ 21,835,000    
Number of properties owned | property_unit 1,026,000    
Purchase Price $ 103,215,000    
Acquisition Debt $ 66,350,000    
Joint venture, forty six percent ownership      
Schedule of Equity Method Investments [Line Items]      
Number of real estate properties to be constructed | property_unit 339    
Columbia, SC | Joint venture, thirty two percent ownership      
Schedule of Equity Method Investments [Line Items]      
Contributions to unconsolidated joint ventures $ 5,670,000    
Joint ventures ownership, percentage 32.00%    
Number of properties owned | property_unit 374,000    
Purchase Price $ 58,300,000    
Acquisition Debt 41,000,000    
Columbia, SC (Location 2) | Joint venture, forty six percent ownership      
Schedule of Equity Method Investments [Line Items]      
Contributions to unconsolidated joint ventures $ 8,665,000    
Joint ventures ownership, percentage 46.00%    
Number of properties owned | property_unit 339,000    
Purchase Price $ 5,915,000    
Acquisition Debt 0    
Forney, TX | Joint venture, fifty percent ownership      
Schedule of Equity Method Investments [Line Items]      
Contributions to unconsolidated joint ventures $ 7,500,000    
Joint ventures ownership, percentage 50.00%    
Number of properties owned | property_unit 313,000    
Purchase Price $ 39,000,000    
Acquisition Debt 25,350,000    
Secured debt | Joint venture, forty six percent ownership      
Schedule of Equity Method Investments [Line Items]      
Construction Loan $ 47,426,000    
Debt Instrument, Interest Rate, Stated Percentage 4.08%