Life Insurance Liability - (Balance Changes Liabilities Investment Contracts) (Details) - Life and Annuity Insurance Product Line [Member] - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Policyholder Account Balance [Roll Forward]
Policyholder contract deposits account balance Beginning of year	$ 2,411,352	$ 2,398,884
Deposits received	496,603	360,124
Surrenders and withdrawals	(446,951)	(379,099)
Benefit payments	(40,915)	(39,990)
Other	6,413
Interest credited	84,920	71,433
End of period	$ 2,511,422	$ 2,411,352
Weighted average credited rate	3.45%	3.03%
Cash surrender value	$ 2,164,100	$ 2,104,617

Amount of cash to be paid to policyholder upon termination and surrender of long-duration contract issued by insurance entity.

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Amount of interest expense for allocation to policyholder account balance.

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Amount of increase (decrease) in liability for policyholder account balance from change, classified as other.

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Amount of cash inflow to policyholder account balance from premium received.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of decrease in liability for policyholder account balance from contract redemption and withdrawal of funds.

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Weighted-average crediting rate for liability for policyholder account balance, calculated at a point in time.

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Amount due to policyholder. Includes, but is not limited to, unpaid policy dividend, retrospective refund, and undistributed earnings on participating business. Excludes future policy benefit and claim expense.

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