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Retirement Plan And Other Post-Retirement Benefits (Tables) | 9 Months Ended
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Jun. 30, 2025
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Cost (Income) | Components of Net Periodic Benefit Cost (in thousands):
| Retirement Plan |  | Other Post-Retirement Benefits
Three Months Ended June 30, | 2025 | 2024 |  | 2025 | 2024
Service Cost | $ | 1,023 |  | $ | 1,049 |  |  | $ | 130 |  | $ | 109 |
Interest Cost | 9,223 |  | 10,890 |  |  | 3,625 |  | 3,890 |
Expected Return on Plan Assets | (14,647) |  | (17,086) |  |  | (6,536) |  | (6,660) |
Amortization of Prior Service Cost (Credit) | 76 |  | 91 |  |  | (107) |  | (107) |
Amortization of (Gains) Losses | 1,620 |  | (335) |  |  | 9 |  | (567) |
Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1) | 85 |  | 4,057 |  |  | (447) |  | 2,248 |
Net Periodic Benefit Cost (Income) | $ | (2,620) |  | $ | (1,334) |  |  | $ | (3,326) |  | $ | (1,087) |
| Retirement Plan |  | Other Post-Retirement Benefits
Nine Months Ended June 30, | 2025 | 2024 |  | 2025 | 2024
Service Cost | $ | 3,069 |  | $ | 3,148 |  |  | $ | 389 |  | $ | 326 |
Interest Cost | 27,669 |  | 32,668 |  |  | 10,876 |  | 11,671 |
Expected Return on Plan Assets | (43,940) |  | (51,257) |  |  | (19,608) |  | (19,981) |
Amortization of Prior Service Cost (Credit) | 227 |  | 271 |  |  | (322) |  | (322) |
Amortization of (Gains) Losses | 4,860 |  | (1,004) |  |  | 28 |  | (1,700) |
Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1) | (3,026) |  | 12,173 |  |  | (5,333) |  | 6,256 |
Net Periodic Benefit Cost (Income) | $ | (11,141) |  | $ | (4,001) |  |  | $ | (13,970) |  | $ | (3,750) |
(1)The Company’s policy is to record retirement plan and other post-retirement benefit costs in the Utility segment on a volumetric basis to reflect the fact that the Utility segment experiences higher throughput of natural gas in the winter months and lower throughput of natural gas in the summer months.

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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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