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Pension And Other Postretirement Benefit Plans (Tables) | 9 Months Ended
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Dec. 31, 2024
Retirement Benefits [Abstract] |
Components of Company's Net Periodic Benefit Cost | The components of the Company’s net periodic benefit cost were as follows:
|  | Pension Benefits |  | Other Postretirement Benefits
|  | Three Months Ended December 31, |  | Three Months Ended December 31,
(in thousands of dollars) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Service cost |  | $ | 1,315 |  |  | $ | 1,280 |  |  | $ | 22 |  |  | $ | 24 |
Interest cost |  | 2,875 |  |  | 2,897 |  |  | 259 |  |  | 263 |
Expected return on plan assets |  | (3,606) |  |  | (3,887) |  |  | (13) |  |  | (15) |
Net amortization and deferral |  | 174 |  |  | 205 |  |  | (157) |  |  | (189) |
Net periodic benefit cost |  | $ | 758 |  |  | $ | 495 |  |  | $ | 111 |  |  | $ | 83 |
|  | Pension Benefits |  | Other Postretirement Benefits
|  | Nine Months Ended December 31, |  | Nine Months Ended December 31,
(in thousands of dollars) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Service cost |  | $ | 3,956 |  |  | $ | 3,848 |  |  | $ | 69 |  |  | $ | 73 |
Interest cost |  | 8,629 |  |  | 8,696 |  |  | 794 |  |  | 793 |
Expected return on plan assets |  | (10,820) |  |  | (11,663) |  |  | (41) |  |  | (47) |
Net amortization and deferral |  | 522 |  |  | 611 |  |  | (477) |  |  | (569) |
Net periodic benefit cost |  | $ | 2,287 |  |  | $ | 1,492 |  |  | $ | 345 |  |  | $ | 250 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 20 -Topic 715 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-3 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-4 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-2 + Details
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