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Life Insurance Liabilities (Sensitive Life Insurance Type Products) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Interest expense | $ 71,498,000 | $ 63,943,000 | $ 138,716,000 | $ 124,541,000
Life Insurance Segment [Member] | Oxford |  |  |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Gross premiums | $ 25,043,000 | $ 26,667,000 | 25,043,000 | 26,667,000
Interest expense |  |  | $ 7,589,000 | $ 7,612,000
Expected future lifetime (persistency) of policies in force (years) | 6 years 9 months 18 days | 6 years 10 months 24 days | 6 years 9 months 18 days | 6 years 10 months 24 days
Weighted average original interest rate of the liability for future policy benefits | 4.97% | 5.00% | 4.97% | 5.00%
Weighted average current interest rate of the liability for future policy benefits | 5.13% | 4.65% | 5.13% | 4.65%
Life Insurance Segment [Member] | Oxford | Expected gross premiums: |  |  |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Undiscounted balance | $ 723,862,000 | $ 761,261,000 | $ 723,862,000 | $ 761,261,000
Discounted balance at original discount rate | 272,992,000 | 299,161,000 | 272,992,000 | 299,161,000
Discounted balance at current discount rate | 266,964,000 | 296,505,000 | 266,964,000 | 296,505,000
Life Insurance Segment [Member] | Oxford | Expected policy benefits: |  |  |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Undiscounted balance | 350,890,000 | 387,141,000 | 350,890,000 | 387,141,000
Discounted balance at original discount rate | 503,526,000 | 523,777,000 | 503,526,000 | 523,777,000
Discounted balance at current discount rate | $ 493,213,000 | $ 524,726,000 | $ 493,213,000 | $ 524,726,000
Life Insurance Segment [Member] | Oxford | Lapses actual experience |  |  |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Market Risk Benefit Measurement Input | 0.0506 | 0.0502 | 0.0506 | 0.0502
Life Insurance Segment [Member] | Oxford | Mortality expected experience |  |  |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Market Risk Benefit Measurement Input | 0.0544 | 0.0506 | 0.0544 | 0.0506
Life Insurance Segment [Member] | Oxford | Lapses actual experience |  |  |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Market Risk Benefit Measurement Input | 0.019 | 0.0187 | 0.019 | 0.0187
Life Insurance Segment [Member] | Oxford | Lapses expected experience |  |  |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Market Risk Benefit Measurement Input | 0.0273 | 0.0265 | 0.0273 | 0.0265

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