INVESTMENTS - INVESTMENTS IN LEASEHOLD LAND INTERESTS - LOT 4C (Details) a in Thousands, $ in Thousands	12 Months Ended
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

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration