INVESTMENTS - SALE OF INTEREST IN LEASEHOLD LAND (Details)	1 Months Ended	5 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2018 USD ($)	Mar. 06, 2019 USD ($)	Jun. 30, 2020 USD ($) lot	Sep. 30, 2017	Sep. 30, 2016	Mar. 07, 2019 USD ($) day	Sep. 30, 2018 a
KD Acquisition II, LP | Investment 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 | Investment 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			$ 216,400,000
Number of single family lots sold | lot			0
Number of lots remaining to be sold | lot			19
Number of lots developed | lot			80
KD Kaupulehu LLLP Increment II | Kaupulehu Developments
Investment Holdings [Line Items]
Number of single family lots sold				1	1
Number of lots developed				2
Gain contingency, unrecorded amount		$ 8,000,000
50% of Increment II distributions received	$ 1,000,000	$ 3,500,000
KD Kaupulehu LLLP Increment II Phase 2A | Investment in land development partnerships
Investment Holdings [Line Items]
Number of single family lots, rights to		3				3
KD Acquisition, LLLP | Investment 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 | Investment 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 | Investment in land development partnerships
Investment Holdings [Line Items]
Collaborative agreement, fees, percentage of cumulative net profits						0.72%
Pool Of Various Individuals | Investment in land development partnerships
Investment Holdings [Line Items]
Collaborative agreement, fees, percentage of cumulative net profits						0.20%
Aggregrate gross procceds 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 | Aggregrate gross procceds 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 | Aggregrate gross procceds 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
KD Kaupulehu LLLP Increment II | Kaupulehu Developments
Investment Holdings [Line Items]
Percent of Increment II distributions		50.00%
Gain contingency, unrecorded amount		$ 8,000,000
50% of Increment II distributions received		$ 3,500,000
KD Kaupulehu LLLP Increment II | Kaupulehu Developments | Investment in land development partnerships
Investment Holdings [Line Items]
Percent of Increment II distributions		50.00%