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Life Insurance Liability (Sensitive Life Insurance Type Products) (Details) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($)
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Interest expense | $ 256,175 | $ 223,958 | $ 167,424
Life Insurance Segment [Member] |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross premiums | $ 52,909 | $ 56,563 |
Expected future lifetime (persistency) of policies in force (years) | 6 years 9 months 18 days | 7 years |
Weighted average original interest rate of the liability for future policy benefits | 4.99% | 5.03% |
Weighted average current interest rate of the liability for future policy benefits | 5.03% | 0.56% |
Life Insurance Segment [Member] | Oxford |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Interest expense | $ 15,322 | $ 15,441 |
Expected gross premiums: | Life Insurance Segment [Member] |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Undiscounted balance | 367,640 | 405,017 |
Discounted balance at original discount rate | 285,087 | 311,988 |
Discounted balance at current discount rate | 286,295 | 308,822 |
Expected policy benefits: | Life Insurance Segment [Member] |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Undiscounted balance | 742,927 | 779,778 |
Discounted balance at original discount rate | 514,112 | 533,688 |
Discounted balance at current discount rate | $ 522,121 | $ 530,983 |
Lapses actual experience | Life Insurance Segment [Member] |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Market Risk Benefit, Measurement Input | 0.0449 | 0.0467 |
Mortality expected experience | Life Insurance Segment [Member] |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Market Risk Benefit, Measurement Input | 0.0506 | 0.048 |
Lapses actual experience | Life Insurance Segment [Member] |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Market Risk Benefit, Measurement Input | 0.021 | 0.0204 |
Lapses expected experience | Life Insurance Segment [Member] |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Market Risk Benefit, Measurement Input | 0.0263 | 0.0252 |

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