Life Insurance Liability (Present Value Expected Future Policy Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Life and annuity ICOS and IBNR / Reinsurance losses payable				$ 41,438
Total	$ 849,113	$ 880,202		$ 909,701	$ 1,040,951
Life Insurance Segment [Member]
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Total	20,400	21,600
Life Insurance Segment [Member] | Oxford
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, beginning of year	530,984	672,254
Beginning balance at original discount rate	533,689	552,109
Effect of actual variances from expected experience		(2,483)	$ (3,964)
Adjusted beginning of year balance		531,206	548,145
Issuances	8,513	14,118
Interest accrual	26,507	27,572
Net premium collected	(52,113)	(56,146)
Ending balance at original discount rate	514,113	533,689	552,109
Effect of changes in discount rate assumptions (AOCI)	8,009	(2,705)
Balance, end of the year	522,122	530,984	$ 672,254
End of period, LFPB, net	316,733	307,866
Payout annuities and market risk benefits	31,337	31,060
Life and annuity ICOS and IBNR / Reinsurance losses payable	27,432	29,534
Life DPL, Other life and health	9,208	9,973
End of period balance, Oxford	396,918	391,968
Balance, Moving and Storage	319,716	335,227
Balance, Property and Casualty	132,479	153,007
Total	$ 849,113	$ 880,202