Life Insurance Liabilities (Balance Changes Liabilities Investment Contracts) (Details) - Deferred Fixed Annuity [Member] - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Policyholder Account Balance [Roll Forward]
Policyholder contract deposits account balance Beginning of year	$ 2,411,352	$ 2,398,884
Deposits received	389,848	206,800
Surrenders and withdrawals	(290,875)	(265,999)
Benefit payments	(27,130)	(29,136)
Interest credited	58,290	52,594
Other	5,455
End of period	$ 2,546,940	$ 2,363,143
Weighted average credited rate	3.35%	2.96%
Cash surrender value	$ 2,257,207	$ 2,025,409