RETIREMENT PLANS (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2026 |
Mar. 31, 2025 |
Sep. 30, 2025 |
|
| Pension Plan | |||||
| Net periodic benefit cost: | |||||
| Interest cost | $ 102 | $ 97 | $ 204 | $ 195 | |
| Expected return on plan assets | (217) | (200) | (435) | (400) | |
| Amortization of net actuarial gain | (13) | 0 | (25) | 0 | |
| Net periodic benefit (income) cost | (128) | (103) | (256) | (205) | |
| Other disclosures | |||||
| Estimated future contributions | $ 0 | $ 0 | |||
| Number of Barnwell common stock held by the Pension Plan | 676,296 | 676,296 | 666,077 | ||
| SERP | |||||
| Net periodic benefit cost: | |||||
| Interest cost | $ 26 | 24 | $ 52 | 47 | |
| Expected return on plan assets | 0 | 0 | 0 | 0 | |
| Amortization of net actuarial gain | 0 | 0 | 0 | 0 | |
| Net periodic benefit (income) cost | 26 | $ 24 | 52 | $ 47 | |
| Other disclosures | |||||
| Estimated future contributions | $ 261 | $ 261 | |||
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of contributions received and expected to be received by defined benefit plan from employer in current fiscal year. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Number of shares of employer stock in which defined benefit plan asset is invested. Includes, but is not limited to, stock issued or managed by related party of employer. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|