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RETIREMENT PLANS (Tables) | 9 Months Ended
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Jun. 30, 2022
Retirement Benefits [Abstract] |
Schedule of components of net periodic benefit cost (income) | The following tables detail the components of net periodic benefit (income) cost for Barnwell’s retirement plans:
| Pension Plan |  | SERP |  | Post-retirement Medical
| Three months ended June 30,
| 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Interest cost | $ | 73,000 |  |  | $ | 64,000 |  |  | $ | 15,000 |  |  | $ | 13,000 |  |  | $ | — |  |  | $ | 12,000 |
Expected return on plan assets | (156,000) |  |  | (136,000) |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of net actuarial loss | — |  |  | 10,000 |  |  | — |  |  | — |  |  | — |  |  | 16,000 |
Net periodic benefit (income) cost | $ | (83,000) |  |  | $ | (62,000) |  |  | $ | 15,000 |  |  | $ | 13,000 |  |  | $ | — |  |  | $ | 28,000 |
| Pension Plan |  | SERP |  | Post-retirement Medical
| Nine months ended June 30,
| 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Interest cost | $ | 218,000 |  |  | $ | 193,000 |  |  | $ | 45,000 |  |  | $ | 39,000 |  |  | $ | — |  |  | $ | 48,000 |
Expected return on plan assets | (467,000) |  |  | (410,000) |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of net actuarial loss | — |  |  | 30,000 |  |  | — |  |  | — |  |  | — |  |  | 62,000 |
Net periodic benefit (income) cost | $ | (249,000) |  |  | $ | (187,000) |  |  | $ | 45,000 |  |  | $ | 39,000 |  |  | $ | — |  |  | $ | 110,000 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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