Reinsurance and Policy Benefits and Losses, Claims, and Loss Expenses Payable (Incurred Claims Development) (Details) $ in Thousands	Mar. 31, 2024 USD ($) Claims	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net	$ 23,141
Accident Year 2017 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net	15,260	$ 15,264	$ 15,273	$ 15,538	$ 17,078	$ 16,109	$ 15,748
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net
Shortduration Insurance Contracts Number Of Reported Claims | Claims	12,308
Accident Year 2018 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net	$ 16,856	16,819	17,157	18,027	18,386	$ 19,580
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net
Shortduration Insurance Contracts Number Of Reported Claims | Claims	12,220
Accident Year 2019 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net	$ 27,793	27,831	27,316	26,316	$ 22,138
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net	$ 1,050
Shortduration Insurance Contracts Number Of Reported Claims | Claims	12,040
Accident Year 2020 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net	$ 14,561	17,107	17,485	$ 20,671
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net	$ 829
Shortduration Insurance Contracts Number Of Reported Claims | Claims	11,552
Accident Year 2021 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net	$ 24,484	25,337	$ 28,982
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net	$ 4,702
Shortduration Insurance Contracts Number Of Reported Claims | Claims	14,192
Accident Year 2022 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net	$ 28,436	$ 27,570
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net	$ 5,911
Shortduration Insurance Contracts Number Of Reported Claims | Claims	13,152
Accident Year 2023 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net	$ 25,396
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net	$ 10,649
Shortduration Insurance Contracts Number Of Reported Claims | Claims	13,948