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Employee Benefit Plans - Healthcare Cost Trend Rates (Details) - Officer Medical Plan - Other Postretirement Benefits Plan | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items] |  |
Health care cost trend rate assumed for next year, Pre 65 | 8.25% | 7.25%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate), Pre 65 | 4.50% | 4.50%
Health care cost trend rate assumed for next year, Post 65 | 8.95% | 7.50%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate), Post 65 | 4.50% | 4.50%

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- Definition Defined Benefit Plan, Health Care Cost Trend Rate Assumed For Next Fiscal Year, Post 65 + References No definition available. + Details
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- Definition Defined Benefit Plan, Health Care Cost Trend Rate Assumed For Next Fiscal Year, Pre 65 + References No definition available. + Details
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- Definition Defined Benefit Plan, Ultimate Health Care Cost Trend Rate, Post 65 + References No definition available. + Details
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- Definition Defined Benefit Plan, Ultimate Health Care Cost Trend Rate, Pre 65 + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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