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Life Insurance Liabilities (Sensitive Life Insurance Type Products) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Interest expense | $ 90,305,000 | $ 71,498,000 | $ 172,635,000 | $ 138,716,000
Life Insurance Segment [Member] | Oxford |  |  |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Gross premiums | $ 23,444,000 | $ 25,043,000 | 23,444,000 | 25,043,000
Interest expense |  |  | $ 7,394,000 | $ 7,589,000
Expected future lifetime (persistency) of policies in force (years) | 6 years 8 months 12 days | 6 years 9 months 18 days | 6 years 8 months 12 days | 6 years 9 months 18 days
Weighted average original interest rate of the liability for future policy benefits | 4.91% | 4.97% | 4.91% | 4.97%
Weighted average current interest rate of the liability for future policy benefits | 4.37% | 5.13% | 4.37% | 5.13%
Life Insurance Segment [Member] | Oxford | Expected gross premiums: |  |  |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Undiscounted balance | $ 675,928,000 | $ 723,862,000 | $ 675,928,000 | $ 723,862,000
Discounted balance at original discount rate | 247,543,000 | 272,992,000 | 247,543,000 | 272,992,000
Discounted balance at current discount rate | 248,018,000 | 266,964,000 | 248,018,000 | 266,964,000
Life Insurance Segment [Member] | Oxford | Expected policy benefits: |  |  |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Undiscounted balance | 319,669,000 | 350,890,000 | 319,669,000 | 350,890,000
Discounted balance at original discount rate | 470,113,000 | 503,526,000 | 470,113,000 | 503,526,000
Discounted balance at current discount rate | $ 471,382,000 | $ 493,213,000 | $ 471,382,000 | $ 493,213,000
Life Insurance Segment [Member] | Oxford | Lapses actual experience |  |  |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Market Risk Benefit Measurement Input | 0.0715 | 0.0506 | 0.0715 | 0.0506
Life Insurance Segment [Member] | Oxford | Mortality expected experience |  |  |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Market Risk Benefit Measurement Input | 0.0667 | 0.0544 | 0.0667 | 0.0544
Life Insurance Segment [Member] | Oxford | Lapses actual experience |  |  |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Market Risk Benefit Measurement Input | 0.0231 | 0.019 | 0.0231 | 0.019
Life Insurance Segment [Member] | Oxford | Lapses expected experience |  |  |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Market Risk Benefit Measurement Input | 0.0312 | 0.0273 | 0.0312 | 0.0273

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