Life Insurance Liability (Present Value Expected Net Premiums) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2020
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Effect of actual variances from expected variances			$ 2,580
Other			464,481
Effect of changes in discount rate assumptions (AOCI)					$ 337,022
Balance, end of period			123,132
Life Insurance Segment [Member] | Oxford
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Balance, beginning of the year	$ 223,118	$ 280,371
Beginning balance at original discount rate	225,071	242,741
Effect of changes in cash flow assumptions		(932)		$ (1,565)
Adjust beginning of year balance	224,139	241,176
Issuances	8,491	14,118
Interest accrual	11,185	12,131
Net premium collected	(39,509)	(42,354)
Ending balance at original discount rate	204,306	225,071
Effect of changes in discount rate assumptions (AOCI)	1,083	(1,953)
Balance, end of period	$ 205,389	$ 223,118
Health Insurance Product Line [Member]
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Other			23,188
Effect of changes in discount rate assumptions (AOCI)					$ 18,341
Balance, end of period			$ 4,847