Reinsurance And Policy Benefits And Losses Claims And Loss Expenses Payable (Cumulative Paid Claims And Allocated Claim Adjustment Expense Net Of Reinsurance) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	$ 115,430
All outstanding liabilities before 2012, net of reinsurance	57,647
Liabilities for claims and claim adjustment expenses, net of reinsurance	95,004
Accident Year 2017 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	15,260	$ 15,264	$ 15,263	$ 15,012	$ 14,825	$ 11,638	$ 8,970
Accident Year 2018 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	16,851	16,809	16,766	15,150	12,689	$ 8,838
Accident Year 2019 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	25,122	21,598	19,215	14,737	$ 7,366
Accident Year 2020 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	13,510	12,521	11,114	$ 7,665
Accident Year 2021 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	16,829	14,831	$ 11,040
Accident Year 2022 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	18,444	$ 10,572
Accident Year 2023 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	$ 9,414