| 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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