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Reserve for Future Policy Benefits and Contractholder Funds - Schedule of Key Assumptions used in Calculating the Reserve for Future Policy Benefits (Details) | Mar. 31, 2024 | Mar. 31, 2023
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Accident and health insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Weighted-average duration (in years) | 4 years 3 months 18 days | 4 years 1 month 6 days
Interest accretion rate (discount rate at contract issuance) | 4.96% | 5.09%
Current discount rate (upper-medium grade fixed income yield) | 5.02% | 4.58%
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Weighted-average duration (in years) | 15 years 1 month 6 days | 14 years 1 month 6 days
Interest accretion rate (discount rate at contract issuance) | 5.41% | 5.50%
Current discount rate (upper-medium grade fixed income yield) | 5.35% | 5.03%

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