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Retirement Plan And Other Post-Retirement Benefits | 9 Months Ended
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Jun. 30, 2025
Retirement Benefits [Abstract] |
Retirement Plan and Other Post-Retirement Benefits | Retirement Plan and Other Post-Retirement Benefits 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. The components of net periodic benefit cost other than service cost are presented in Other Income (Deductions) on the Consolidated Statements of Income. Employer Contributions. The Company did not make any contributions to its tax-qualified, noncontributory defined benefit retirement plan (Retirement Plan) during the nine months ended June 30, 2025, and does not anticipate making any such contributions during the remainder of fiscal 2025. The Company also did not make any contributions to its VEBA trusts for its other post-retirement benefits during the nine months ended June 30, 2025, and does not anticipate making any such contributions during the remainder of fiscal 2025.

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