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Policyholders' Liabilities - Liabilities for Future Policy Benefits, Weighted Average (Details)
Sep. 30, 2025
Sep. 30, 2024
Life Insurance, Permanent    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Weighted-Average Duration, Original Discount 8 years 9 months 18 days 8 years 7 months 6 days
Liability for Future Policy Benefit, Weighted-Average Duration 8 years 9 months 18 days 8 years 7 months 6 days
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate 4.85% 4.87%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 4.81% 4.61%
Life Insurance, Permanent Limited Pay    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Weighted-Average Duration, Original Discount 8 years 7 months 6 days 8 years 1 month 6 days
Liability for Future Policy Benefit, Weighted-Average Duration 8 years 7 years 9 months 18 days
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate 4.28% 4.28%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 4.88% 4.63%
Home Service Insurance, Life Insurance, Permanent    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Weighted-Average Duration, Original Discount 15 years 3 months 18 days 16 years
Liability for Future Policy Benefit, Weighted-Average Duration 14 years 3 months 18 days 15 years 7 months 6 days
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate 4.83% 4.96%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.35% 5.03%
Home Service Insurance, Life Insurance, Permanent Limited Pay    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Weighted-Average Duration, Original Discount 13 years 9 months 18 days 14 years 8 months 12 days
Liability for Future Policy Benefit, Weighted-Average Duration 13 years 1 month 6 days 14 years 8 months 12 days
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate 4.88% 5.03%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.32% 5.02%