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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 ($)
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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 |  |  |  |  |  |

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- Definition Undiscounted amount, after reinsurance, of incurred-but-not-reported (IBNR) liabilities plus expected development on reported claims, for claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 4D -Subparagraph (a) -SubTopic 40 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-4D Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 4E -SubTopic 40 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-4E + Details
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