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INVESTMENTS - INVESTMENTS IN LEASEHOLD LAND INTERESTS - LOT 4C (Details) a in Thousands, $ in Thousands | 12 Months Ended
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Sep. 30, 2021 USD ($) a | Sep. 30, 2020 USD ($)
Investment Holdings [Line Items] |  |
Impairment of assets | $ 668 | $ 4,376
Investment in leasehold land interest - Lot 4C |  |
Investment Holdings [Line Items] |  |
Area of land (in acres) | a | 1 |
Impairment of assets |  | $ 50

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