INVESTMENTS INVESTMENTS - SALE OF INTEREST IN LEASEHOLD LAND (Details)	1 Months Ended	3 Months Ended	12 Months Ended
	Jun. 30, 2018 USD ($)	Dec. 16, 2020 USD ($) lot	Sep. 30, 2020 USD ($) lot	Sep. 30, 2019 USD ($)	Sep. 30, 2017 a lot	Sep. 30, 2016 lot	Mar. 07, 2019 USD ($) day
Kaupulehu Developments
Investment Holdings [Line Items]
Revenues - sale of interest in leasehold land			$ 325,000	$ 165,000
KD Acquisition II, LP | Investments in land development partnerships
Investment Holdings [Line Items]
Collaborative agreement, percentage of distributions							15.00%
Collaborative agreement, percentage of cumulative net profits, priority payment							10.00%
Collaborative agreement, percentage of cumulative net profits, priority payment, maximum amount							$ 3,000,000
KD Acquisition II, LP | KD Kaupulehu, LLLP | Investments in land development partnerships
Investment Holdings [Line Items]
Ownership interest acquired							55.00%
KD Kaupulehu LLLP Increment I | Kaupulehu Developments
Investment Holdings [Line Items]
Aggregate gross proceeds from sale of Increment I single family lots for calculating payments entitled to be received			$ 219,700,000
Number of single family lots sold | lot			2
Number of lots developed | lot			80
KD Kaupulehu LLLP Increment I | Kaupulehu Developments | Subsequent Event
Investment Holdings [Line Items]
Number of single family lots sold | lot		1
Number of lots remaining to be sold | lot		16
Revenues - sale of interest in leasehold land		$ 170,000
KD Kaupulehu LLLP Increment II | Kaupulehu Developments
Investment Holdings [Line Items]
Number of single family lots sold | lot					1	1
Number of lots developed | a					2
50% of Increment II distributions received	$ 1,000,000
KD Kaupulehu LLLP Increment II Phase 2A | Investments in land development partnerships
Investment Holdings [Line Items]
Number of single family lots, rights to			3				3
KD Acquisition, LLLP | Investments in land development partnerships
Investment Holdings [Line Items]
Ownership interest acquired			19.60%
KD Kaupulehu LLLP Increment II Phase 2A, lots completed subsequent to Phase 2A | Investments in land development partnerships
Investment Holdings [Line Items]
Number of single family lots, rights to							4
Collaborative agreement, commitment to construct improvements term | day							90
KD Development, LLC | Investments in land development partnerships
Investment Holdings [Line Items]
Collaborative agreement, fees, percentage of cumulative net profits							0.72%
Pool Of Various Individuals | Investments in land development partnerships
Investment Holdings [Line Items]
Collaborative agreement, fees, percentage of cumulative net profits							0.20%
Aggregate gross proceeds greater than $100,000,000 up to $300,000,000 | KD Kaupulehu LLLP Increment I | Kaupulehu Developments
Investment Holdings [Line Items]
Payments entitled to be received as percentage of gross proceeds from sale of single family lots			10.00%
Aggregate gross proceeds in excess of $300,000,000 | KD Kaupulehu LLLP Increment I | Kaupulehu Developments
Investment Holdings [Line Items]
Payments entitled to be received as percentage of gross proceeds from sale of single family lots			14.00%
Minimum | KD Kaupulehu LLLP Increment II | Kaupulehu Developments
Investment Holdings [Line Items]
Payments entitled to be received as percentage of gross proceeds from sale of single family lots			8.00%
Payments entitled to be received as percentage of gross proceeds from sale of units on a lot			2.60%
Increment II lot size | a					2
Minimum | Aggregate gross proceeds greater than $100,000,000 up to $300,000,000 | KD Kaupulehu LLLP Increment I | Kaupulehu Developments
Investment Holdings [Line Items]
Aggregate gross proceeds from sale of Increment I single family lots for calculating payments entitled to be received			$ 100,000,000
Minimum | Aggregate gross proceeds in excess of $300,000,000 | KD Kaupulehu LLLP Increment I | Kaupulehu Developments
Investment Holdings [Line Items]
Aggregate gross proceeds from sale of Increment I single family lots for calculating payments entitled to be received			$ 300,000,000
Maximum | KD Kaupulehu LLLP Increment II | Kaupulehu Developments
Investment Holdings [Line Items]
Payments entitled to be received as percentage of gross proceeds from sale of single family lots			10.00%
Payments entitled to be received as percentage of gross proceeds from sale of units on a lot			3.25%
Increment II lot size | a					3
Maximum | Aggregate gross proceeds greater than $100,000,000 up to $300,000,000 | KD Kaupulehu LLLP Increment I | Kaupulehu Developments
Investment Holdings [Line Items]
Aggregate gross proceeds from sale of Increment I single family lots for calculating payments entitled to be received			$ 300,000,000