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INVESTMENTS - INVESTMENT IN KUKIO RESORT LAND DEVELOPMENT PARTNERSHIP (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Nov. 27, 2013 USD ($) partnership | Mar. 31, 2020 USD ($) lot | Mar. 31, 2019 USD ($) | Mar. 31, 2020 USD ($) lot | Mar. 31, 2019 USD ($) | Mar. 07, 2019
Investment Holdings [Line Items] |  |  |  |  |  |
Equity in loss of affiliates |  | $ (25) | $ (207) | $ (68) | $ (286) |
Investment in land development partnerships |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Number of limited liability limited partnerships formed | partnership | 2 |  |  |  |  |
Cash distribution from equity method investment |  |  |  | 0 | 314 |
Cumulative cash distributions from Kukio Resort Land Development Partnerships made to date |  |  |  | 45,000 |  |
Equity in loss of affiliates |  | (25) | $ (207) | (68) | (286) |
Difference between carrying amount and underlying equity |  | $ 292 |  | 292 |  |
Basis difference adjustment |  |  |  | $ 5 | 1 |
K D Kukio Resorts LLLP | Investment in land development partnerships |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Ownership interest acquired | 19.60% |  |  |  |  |
Indirectly Acquired Interest | Investment in land development partnerships |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Aggregate cost | $ 5,140 |  |  |  |  |
KD Acquisition, LLLP | Investment in land development partnerships |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Ownership interest acquired |  | 19.60% |  | 19.60% |  |
K D Maniniowali L L L P | Investment in land development partnerships |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Ownership interest acquired | 19.60% |  |  |  |  |
KKM Makai LLLP | Investment in land development partnerships |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Ownership interest acquired | 34.45% |  |  |  |  |
KD Kaupulehu, LLLP | Investment in land development partnerships |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Ownership interest acquired | 19.60% |  |  |  |  |
KD Kaupulehu LLLP Increment I | Investment in land development partnerships |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Number of residential lots remaining to be sold | lot |  | 19 |  | 19 |  |
KD Kaupulehu, LLLP | KD Acquisition II, LP | Investment in land development partnerships |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Ownership interest acquired |  |  |  |  |  | 55.00%
Replay | KD Acquisition II, LP | Investment in land development partnerships |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Ownership interest acquired |  |  |  |  |  | 45.00%
Barnwell Industries Inc | KD Acquisition II, LP | Investment in land development partnerships |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Ownership interest acquired |  | 10.80% |  | 10.80% |  |
Barnwell Hawaiian Properties, Inc. | KKM Makai LLLP | Investment in land development partnerships |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Preferred Return to be Received as Percentage from KKM | 100.00% |  |  |  |  |
Non-controlling Interests | Investment in land development partnerships |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Cash distribution from equity method investment |  |  |  |  | $ 38 |
Maximum | Barnwell Hawaiian Properties, Inc. | KKM Makai LLLP | Investment in land development partnerships |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Preferred Return, Amount, from KKM | $ 1,000 |  |  |  |  |
Minimum | Investment in land development partnerships |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Cumulative cash distributions from Kukio Resort Land Development Partnerships, threshold | $ 45,000 |  |  |  |  |

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