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INVESTMENT IN UNCONSOLIDATED VENTURES (Details)
12 Months Ended
Sep. 30, 2018
USD ($)
property_unit
investment
property
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Schedule of Equity Method Investments [Line Items]      
Number of investments | investment 3    
Number of properties owned | property 36    
Carrying value of investment $ 0 $ 21,894,000 $ 0
Unconsolidated joint ventures      
Schedule of Equity Method Investments [Line Items]      
Number of properties owned | property_unit 1,026,000    
Carrying value of investment $ 20,078,000    
Property purchase price 103,215,000    
Mortgage balance $ 100,191,000    
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]      
Number of properties owned | property_unit 374,000    
Carrying value of investment $ 4,670,000    
Property purchase price 58,300,000    
Mortgage balance $ 40,402,000    
Joint ventures ownership, percentage 32.00%    
Columbia, SC (Location 2) | Joint venture, forty six percent ownership      
Schedule of Equity Method Investments [Line Items]      
Number of properties owned | property_unit 339,000    
Carrying value of investment $ 8,581,000    
Property purchase price 5,915,000    
Mortgage balance $ 34,439,000    
Joint ventures ownership, percentage 46.00%    
Forney, TX | Joint venture, fifty percent ownership      
Schedule of Equity Method Investments [Line Items]      
Number of properties owned | property_unit 313,000    
Carrying value of investment $ 6,706,000    
Property purchase price 39,000,000    
Mortgage balance $ 25,350,000    
Joint ventures ownership, percentage 50.00%    
Other | Joint venture, fifty percent ownership      
Schedule of Equity Method Investments [Line Items]      
Number of properties owned | property_unit 0    
Carrying value of investment $ 121,000    
Property purchase price 0    
Mortgage balance 0    
Secured debt | Joint venture, forty six percent ownership      
Schedule of Equity Method Investments [Line Items]      
Construction Loan $ 47,246,000    
Interest rate (as a percent) 4.08%