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Policy Liabilities - Schedule of Weighted Average Duration of Liability For Future Policy Benefits (Details) | Sep. 30, 2025 | Sep. 30, 2024
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Life | American Income |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
At original discount rates | 22 years 5 months 1 day | 22 years 9 months 21 days
At current discount rates | 22 years 3 months 25 days | 23 years 10 days
Life | DTC |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
At original discount rates | 18 years 9 months 29 days | 19 years 5 months 1 day
At current discount rates | 19 years 8 months 26 days | 20 years 9 months 21 days
Life | Liberty National |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
At original discount rates | 15 years 3 months 14 days | 15 years 3 months 21 days
At current discount rates | 15 years 3 months 7 days | 15 years 9 months 18 days
Life | Other premium |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
At original discount rates | 15 years 7 months 24 days | 16 years 25 days
At current discount rates | 16 years 5 months 15 days | 17 years 5 months 23 days
Health | American Income |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
At original discount rates | 13 years 3 months 3 days | 12 years 6 months
At current discount rates | 13 years 3 months 14 days | 12 years 10 months 20 days
Health | DTC |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
At original discount rates | 12 years 5 months 8 days | 11 years 8 months 23 days
At current discount rates | 11 years 3 months 7 days | 10 years 11 months 4 days
Health | Liberty National |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
At original discount rates | 9 years 5 months 23 days | 9 years 3 months 3 days
At current discount rates | 9 years 4 months 20 days | 9 years 5 months 23 days
Health | United American |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
At original discount rates | 12 years 5 months 8 days | 11 years 8 months 23 days
At current discount rates | 11 years 3 months 7 days | 10 years 11 months 4 days
Health | Family Heritage |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
At original discount rates | 16 years 3 months 7 days | 15 years 4 months 2 days
At current discount rates | 15 years 14 days | 14 years 7 months 6 days

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