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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% |  |  |  |  |

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