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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RISKS AND UNCERTAINTIES - Rent Revenues (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Accounting Policies [Abstract] |  |  |
Minimum rents | $ 9,245 | $ 10,168 | $ 9,950
Overage and percentage rents | $ 656 | $ 932 | $ 1,040

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