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Policyholders' Liabilities - Liabilities for Future Policy Benefits, Weighted Average (Details)
Sep. 30, 2024
Sep. 30, 2023
Life Insurance, Permanent    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Weighted-Average Duration, Original Discount 8 years 7 months 6 days 7 years 9 months 18 days
Liability for Future Policy Benefit, Weighted-Average Duration 8 years 7 months 6 days 8 years 2 months 12 days
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate 4.87% 4.92%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 4.61% 5.62%
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 1 month 6 days 7 years 10 months 24 days
Liability for Future Policy Benefit, Weighted-Average Duration 7 years 9 months 18 days 7 years 7 months 6 days
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate 4.28% 4.29%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 4.63% 5.60%
Home Service Insurance, Life Insurance, Permanent    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Weighted-Average Duration, Original Discount 16 years 15 years 8 months 12 days
Liability for Future Policy Benefit, Weighted-Average Duration 15 years 7 months 6 days 15 years 7 months 6 days
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate 4.96% 4.98%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.03% 5.71%
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 14 years 8 months 12 days 14 years 3 months 18 days
Liability for Future Policy Benefit, Weighted-Average Duration 14 years 8 months 12 days 14 years 4 months 24 days
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate 5.03% 5.05%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.02% 5.71%