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Life Insurance Liabilities (Balance Changes Liabilities Investment Contracts) (Details) - Deferred Fixed Annuity [Member] - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Policyholder Account Balance [Roll Forward] |  |
Policyholder contract deposits account balance Beginning of year | $ 2,411,352 | $ 2,398,884
Deposits received | 226,771 | 125,122
Surrenders and withdrawals | (164,919) | (146,647)
Benefit payments | (19,625) | (20,761)
Interest credited | 37,584 | 36,992
Other | 5,868 |
End of period | $ 2,497,031 | $ 2,393,590
Weighted average credited rate | 3.29% | 3.09%
Cash surrender value | $ 2,172,013 | $ 2,062,233

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