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v3.25.1

Life Insurance Liability (Sensitive Life Insurance Type Products) (Details) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2025 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($)
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Interest expense | $ 295,716 | $ 256,175 | $ 223,958
Life Insurance Segment [Member] |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross premiums | $ 49,429 | $ 52,909 |
Expected future lifetime (persistency) of policies in force (years) |  | 6 years 9 months 18 days |
Weighted average original interest rate of the liability for future policy benefits | 4.96% | 4.99% |
Weighted average current interest rate of the liability for future policy benefits | 4.99% | 5.03% |
Life Insurance Segment [Member] | Oxford |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Interest expense | $ 15,253 | $ 15,322 |
Expected gross premiums: | Life Insurance Segment [Member] |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Undiscounted balance | 341,117 | 367,640 |
Discounted balance at original discount rate | 264,878 | 285,087 |
Discounted balance at current discount rate | 260,455 | 286,295 |
Expected policy benefits: | Life Insurance Segment [Member] |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Undiscounted balance | 704,682 | 742,927 |
Discounted balance at original discount rate | 490,975 | 514,112 |
Discounted balance at current discount rate | $ 482,805 | $ 522,121 |
Lapses actual experience | Life Insurance Segment [Member] |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Market Risk Benefit, Measurement Input | 0.0483 | 0.0449 |
Mortality expected experience | Life Insurance Segment [Member] |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Market Risk Benefit, Measurement Input | 0.054 | 0.0506 |
Lapses actual experience | Life Insurance Segment [Member] |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Market Risk Benefit, Measurement Input | 0.0228 | 0.021 |
Lapses expected experience | Life Insurance Segment [Member] |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Market Risk Benefit, Measurement Input | 0.027 | 0.0263 |

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