INVESTMENTS - SALE OF INTEREST IN LEASEHOLD LAND (Details)		5 Months Ended	6 Months Ended	12 Months Ended
	Mar. 07, 2019 USD ($)	Mar. 06, 2019 USD ($)	Mar. 31, 2019 USD ($) lot	Sep. 30, 2017 a	Sep. 30, 2016
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			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				1	1
Number of lots developed				2
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 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	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 | 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 | 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