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RETIREMENT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2024
Pension Plan |  |  |  |  |
Net periodic benefit cost: |  |  |  |  |
Interest cost | $ 98 | $ 103 | $ 293 | $ 308 |
Expected return on plan assets | (200) | (192) | (600) | (575) |
Amortization of net actuarial gain | 0 | 0 | 0 | 0 |
Net periodic benefit (income) cost | (102) | (89) | (307) | (267) |
Other disclosures |  |  |  |  |
Estimated future contributions | $ 0 |  | $ 0 |  |
Number of Barnwell common stock held by the Pension Plan | 520,350 |  | 520,350 |  | 413,148
SERP |  |  |  |  |
Net periodic benefit cost: |  |  |  |  |
Interest cost | $ 24 | 24 | $ 71 | 72 |
Expected return on plan assets | 0 | 0 | 0 | 0 |
Amortization of net actuarial gain | 0 | (21) | 0 | (64) |
Net periodic benefit (income) cost | 24 | $ 3 | 71 | $ 8 |
Other disclosures |  |  |  |  |
Estimated future contributions | $ 76 |  | $ 76 |  |

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