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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RISKS AND UNCERTAINTIES - Rent Revenues (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Accounting Policies [Abstract]      
Minimum rents $ 10,168 $ 9,950 $ 9,735
Overage and percentage rents $ 932 $ 1,040 $ 936