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v3.25.1

Pensions and Other Benefit Plans - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2025 USD ($) yr pensionPlan | Mar. 31, 2024 USD ($) pensionPlan | Mar. 31, 2023 USD ($) | Sep. 30, 2024 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Settlement charge | $ 23,634,000 | $ 4,984,000 | $ 0 |
Fair value of plan assets | 6,342,000 |  |  |
Accrued liabilities | 113,907,000 | 127,973,000 |  |
Other liabilities, noncurrent | 178,538,000 | 202,555,000 |  |
Charge recorded for contributions to defined contribution plans | 6,686,000 | 6,288,000 | 5,808,000 |
Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 0 | 96,935,000 |  |
Defined benefit plan, expected future employer contributions, next fiscal year | 3,778,000 |  |  |
Employer contribution | 5,136,000 | 6,761,000 |  |
Defined benefit plan, net periodic benefit cost (credit) | 27,030,000 | 7,945,000 | $ 1,964,000 |
Liability, defined benefit plan, noncurrent | 62,675,000 | 70,552,000 |  |
Liability, defined benefit plan, current | $ 3,709,000 | 3,786,000 |  |
Postretirement Benefit Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Retirement age | yr | 65 |  |  |
Percentage of premium contributed | 100.00% |  |  |
Defined benefit plan, net periodic benefit cost (credit) | $ 144,000 |  |  |
Liability, defined benefit plan | 733,000 |  |  |
Liability, defined benefit plan, noncurrent | 597,000 |  |  |
Liability, defined benefit plan, current | 136,000 |  |  |
Postretirement Benefit Plans | American Association of Retired Persons |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contribution | 35 |  |  |
Defined Benefit Postretirement Life Insurance |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, net periodic benefit cost (credit) | 32,000 |  |  |
Liability, defined benefit pension plan | 2,917,000 |  |  |
Accrued liabilities | 2,837,000 |  |  |
Other liabilities, noncurrent | 80,000 |  |  |
Cash surrender value of life insurance | $ 2,474,000 | $ 2,392,000 |  |
United States |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Number of pension plans settled | pensionPlan | 1 |  |  |
Plan assets in excess of benefit obligation |  |  |  | $ 6,974,000
Plan assets in excess of benefit obligation, remaining surplus | $ 6,342,000,000 |  |  |
Canada |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Number of pension plans settled | pensionPlan |  | 2 |  |

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