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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RISKS AND UNCERTAINTIES - Rent Revenues (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Accounting Policies [Abstract]      
Minimum rents $ 5,589 $ 9,245 $ 10,168
Overage and percentage rents $ 726 $ 656 $ 932