INVESTMENTS INVESTMENTS - SALE OF INTEREST IN LEASEHOLD LAND (Details)	1 Months Ended	12 Months Ended
	Jun. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) lot	Sep. 30, 2017 lot	Sep. 30, 2016 lot	Mar. 07, 2019 USD ($) day	Sep. 30, 2018 a
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		$ 216,400,000
Number of single family lots sold | lot		1
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 | lot			1	1
Number of lots developed | lot			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