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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) | Sep. 30, 2024 | Sep. 30, 2023
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Accident and health insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Weighted-average duration (in years) | 8 years 3 months 18 days | 4 years 3 months 18 days
Weighted-average interest rates |  |
Interest accretion rate (discount rate at contract issuance) | 5.05% | 4.73%
Current discount rate (upper-medium grade fixed income yield) | 4.65% | 5.28%
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Weighted-average duration (in years) | 15 years 6 months | 14 years 9 months 18 days
Weighted-average interest rates |  |
Interest accretion rate (discount rate at contract issuance) | 5.36% | 5.43%
Current discount rate (upper-medium grade fixed income yield) | 4.82% | 5.56%

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