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Insurance - Schedule of Weighted-Average Interest Rates for the Liability of Future Policy Benefits (Details)
Sep. 30, 2024
Sep. 30, 2023
Term and Whole Life    
Additional Liability, Long-Duration Insurance [Line Items]    
Interest accretion rate 5.28% 5.27%
Current discount rate 4.79% 5.60%
Accidental Death and Disability Protection    
Additional Liability, Long-Duration Insurance [Line Items]    
Interest accretion rate 4.86% 4.86%
Current discount rate 4.86% 5.59%