Policy Benefits And Losses Claims And Loss Expenses Payable (Sensitive Life Insurance Type Products) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Liability For Future Policy Benefits [Abstract]
Gross premiums	$ 67,376	$ 75,085	$ 67,376	$ 75,085
Gross premiums	67,376	75,085	67,376	75,085
Interest expense	67,450	59,041	191,991	166,033
Expected gross premiums:
Liability For Future Policy Benefits [Abstract]
Undiscounted balance	696,990	836,681	696,990	836,681
Discounted balance at original discount rate	540,121	644,354	540,121	644,354
Discounted balance at current discount rate	506,333	613,546	506,333	613,546
Expected policy benefits:
Liability For Future Policy Benefits [Abstract]
Undiscounted balance	1,012,877	1,128,215	1,012,877	1,128,215
Discounted balance at original discount rate	720,700	799,058	720,700	799,058
Discounted balance at current discount rate	680,853	767,672	680,853	767,672
Life Insurance [Member]
Liability For Future Policy Benefits [Abstract]
Interest expense			11,911	12,118
Oxford | Life Insurance [Member]
Liability For Future Policy Benefits [Abstract]
Interest expense			11,463
Life Insurance Segment [Member]
Liability For Future Policy Benefits [Abstract]
Gross premiums	$ 39,979	$ 42,977	$ 39,979	$ 42,977
Expected future lifetime (persistency) of policies in force (years)	6 years 10 months 24 days	7 years	6 years 10 months 24 days	7 years
Weighted average original interest rate of the liability for future policy benefits	5.00%	5.02%	5.00%	5.02%
Weighted average current interest rate of the liability for future policy benefits	4.80%	1.52%	4.80%	1.52%
Life Insurance Segment [Member] | Expected gross premiums:
Liability For Future Policy Benefits [Abstract]
Undiscounted balance	$ 377,068	$ 413,315	$ 377,068	$ 413,315
Discounted balance at original discount rate	291,900	318,749	291,900	318,749
Discounted balance at current discount rate	281,927	313,083	281,927	313,083
Life Insurance Segment [Member] | Expected policy benefits:
Liability For Future Policy Benefits [Abstract]
Undiscounted balance	752,194	793,511	752,194	793,511
Discounted balance at original discount rate	519,099	543,111	519,099	543,111
Discounted balance at current discount rate	$ 499,702	$ 533,597	$ 499,702	$ 533,597
Life Insurance Segment [Member] | Lapses actual experience
Liability For Future Policy Benefits [Abstract]
Market Risk Benefit Measurement Input	0.0457	0.0485	0.0457	0.0485
Life Insurance Segment [Member] | Mortality expected experience
Liability For Future Policy Benefits [Abstract]
Market Risk Benefit Measurement Input	0.0507	0.048	0.0507	0.048
Life Insurance Segment [Member] | Lapses actual experience
Liability For Future Policy Benefits [Abstract]
Market Risk Benefit Measurement Input	0.0218	0.0208	0.0218	0.0208
Life Insurance Segment [Member] | Lapses expected experience
Liability For Future Policy Benefits [Abstract]
Market Risk Benefit Measurement Input	0.0264	0.0252	0.0264	0.0252
Life Insurance Segment [Member] | Morbidity actual experience
Liability For Future Policy Benefits [Abstract]
Market Risk Benefit Measurement Input	0	0	0	0
Life Insurance Segment [Member] | Morbidity expected experience
Liability For Future Policy Benefits [Abstract]
Market Risk Benefit Measurement Input	0	0	0	0
Life Insurance Segment [Member] | Oxford
Liability For Future Policy Benefits [Abstract]
Interest expense				$ 11,618
Health Insurance Product Line [Member]
Liability For Future Policy Benefits [Abstract]
Gross premiums	$ 27,397	$ 32,108	$ 27,397	$ 32,108
Expected future lifetime (persistency) of policies in force (years)	6 years 6 months	6 years 8 months 12 days	6 years 6 months	6 years 8 months 12 days
Weighted average original interest rate of the liability for future policy benefits	4.01%	4.02%	4.01%	4.02%
Weighted average current interest rate of the liability for future policy benefits	4.80%	1.51%	4.80%	1.51%
Health Insurance Product Line [Member] | Expected gross premiums:
Liability For Future Policy Benefits [Abstract]
Undiscounted balance	$ 319,922	$ 423,366	$ 319,922	$ 423,366
Discounted balance at original discount rate	248,221	325,605	248,221	325,605
Discounted balance at current discount rate	224,406	300,463	224,406	300,463
Health Insurance Product Line [Member] | Expected policy benefits:
Liability For Future Policy Benefits [Abstract]
Undiscounted balance	260,683	334,704	260,683	334,704
Discounted balance at original discount rate	201,601	255,947	201,601	255,947
Discounted balance at current discount rate	$ 181,151	$ 234,075	$ 181,151	$ 234,075
Health Insurance Product Line [Member] | Lapses actual experience
Liability For Future Policy Benefits [Abstract]
Market Risk Benefit Measurement Input	0	0	0	0
Health Insurance Product Line [Member] | Mortality expected experience
Liability For Future Policy Benefits [Abstract]
Market Risk Benefit Measurement Input	0	0	0	0
Health Insurance Product Line [Member] | Lapses actual experience
Liability For Future Policy Benefits [Abstract]
Market Risk Benefit Measurement Input	0	0	0	0
Health Insurance Product Line [Member] | Lapses expected experience
Liability For Future Policy Benefits [Abstract]
Market Risk Benefit Measurement Input	0	0	0	0
Health Insurance Product Line [Member] | Morbidity actual experience
Liability For Future Policy Benefits [Abstract]
Market Risk Benefit Measurement Input	0.8117	0.7794	0.8117	0.7794
Health Insurance Product Line [Member] | Morbidity expected experience
Liability For Future Policy Benefits [Abstract]
Market Risk Benefit Measurement Input	0.7365	0.7141	0.7365	0.7141
Health Insurance Product Line [Member] | Oxford
Liability For Future Policy Benefits [Abstract]
Interest expense			$ 448	$ 500