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Life Insurance Liabilities (Sensitive Life Insurance Type Products) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Interest expense | $ 76,581,000 | $ 67,450,000 | $ 215,297,000 | $ 191,991,000
Life Insurance Segment [Member] | Oxford |  |  |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Gross premiums | $ 37,561,000 | $ 39,979,000 | 37,561,000 | 39,979,000
Interest expense |  |  | $ 11,402,000 | $ 11,463,000
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 | 5.20% | 4.80% | 5.20% | 4.80%
Life Insurance Segment [Member] | Oxford | Expected gross premiums: |  |  |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Undiscounted balance | $ 348,354,000 | $ 377,068,000 | $ 348,354,000 | $ 377,068,000
Discounted balance at original discount rate | 270,029,000 | 291,900,000 | 270,029,000 | 291,900,000
Discounted balance at current discount rate | 274,428,000 | 281,927,000 | 274,428,000 | 281,927,000
Life Insurance Segment [Member] | Oxford | Expected policy benefits: |  |  |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Undiscounted balance | 714,265,000 | 752,194,000 | 714,265,000 | 752,194,000
Discounted balance at original discount rate | 496,385,000 | 519,099,000 | 496,385,000 | 519,099,000
Discounted balance at current discount rate | $ 510,163,000 | $ 499,702,000 | $ 510,163,000 | $ 499,702,000
Life Insurance Segment [Member] | Oxford | Lapses actual experience |  |  |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Market Risk Benefit Measurement Input | 0.0489 | 0.0457 | 0.0489 | 0.0457
Life Insurance Segment [Member] | Oxford | Mortality expected experience |  |  |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Market Risk Benefit Measurement Input | 0.0543 | 0.0507 | 0.0543 | 0.0507
Life Insurance Segment [Member] | Oxford | Lapses actual experience |  |  |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Market Risk Benefit Measurement Input | 0.0218 | 0.0218 | 0.0218 | 0.0218
Life Insurance Segment [Member] | Oxford | Lapses expected experience |  |  |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |  |  |
Market Risk Benefit Measurement Input | 0.0272 | 0.0264 | 0.0272 | 0.0264

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