Policy Benefits And Losses Claims And Loss Expenses Payable (Balance Changes Liabilities Investment Contracts) (Details) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Policyholder Account Balance [Roll Forward]
Policyholder contract deposits account balance Beginning of year	$ 8,232
End of period	8,012
Deferred Fixed Annuity [Member]
Policyholder Account Balance [Roll Forward]
Policyholder contract deposits account balance Beginning of year	2,398,884	$ 2,336,238
Deposits received	206,800	243,144
Surrenders and withdrawals	(265,999)	(195,801)
Benefit payments	(29,136)	(27,207)
Interest credited	52,594	40,328
End of period	$ 2,363,143	$ 2,396,702
Weighted average credited rate	2.96%	2.27%
Cash surrender value	$ 2,025,409	$ 2,062,711