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Future Contract Benefit - Summary of Weighted-Average Interest Rates (Details) | Sep. 30, 2024 | Sep. 30, 2023
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Payout Annuities |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest accretion rate | 4.00% | 3.90%
Current discount rate | 4.70% | 5.80%
Traditional Life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Interest accretion rate | 5.00% | 5.00%
Current discount rate | 4.40% | 5.60%

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