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