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EMPLOYEE BENEFIT PLANS (Tables) | 9 Months Ended
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Jun. 30, 2025
Retirement Benefits [Abstract] |
Schedule of Components of Net Periodic Cost | The components of the net periodic cost for pension benefits, including the Company's Pension Equalization Plan, and OPEB costs (principally health care and life insurance) for employees and covered dependents were as follows:
| Pension | OPEB
| Three Months Ended | Nine Months Ended | Three Months Ended | Nine Months Ended
| June 30, | June 30, | June 30, | June 30,
(Thousands) | 2025 | 2024 | 2025 | 2024 | 2025 | 2024 | 2025 | 2024
Service cost | $ | 1,381 |  | $ | 1,244 |  | $ | 4,142 |  | $ | 3,732 |  | $ | 273 |  | $ | 254 |  | $ | 819 |  | $ | 1,151 |
Interest cost | 3,858 |  | 4,060 |  | 11,575 |  | 12,180 |  | 2,096 |  | 1,809 |  | 6,290 |  | 6,519 |
Expected return on plan assets | (5,925) |  | (5,087) |  | (17,775) |  | (15,260) |  | (2,346) |  | (2,021) |  | (7,039) |  | (5,899) |
Recognized actuarial loss | 301 |  | 29 |  | 902 |  | 88 |  | 1,792 |  | 1,256 |  | 5,378 |  | 3,007 |
Prior service cost (credit) amortization | — |  | 16 |  | — |  | 47 |  | (3,270) |  | (3,339) |  | (9,810) |  | (6,676) |
Net periodic benefit (credit) cost | $ | (385) |  | $ | 262 |  | $ | (1,156) |  | $ | 787 |  | $ | (1,455) |  | $ | (2,041) |  | $ | (4,362) |  | $ | (1,898) |

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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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