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Reinsurance and Policy Benefits and Losses, Claims, and Loss Expenses Payable (Incurred Claims Development) (Details) $ in Thousands | Mar. 31, 2025 USD ($) Claims | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($)
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Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 21,926 |  |  |  |  |  |
Accident Year 2018 [Member] |  |  |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | $ 16,885 | $ 16,856 | $ 16,819 | $ 17,157 | $ 18,027 | $ 18,386 | $ 19,580
Shortduration Insurance Contracts Number Of Reported Claims | Claims | 12,221 |  |  |  |  |  |
Accident Year 2019 [Member] |  |  |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | $ 25,766 | 27,793 | 27,831 | 27,316 | 26,316 | $ 22,138 |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 481 |  |  |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | Claims | 12,042 |  |  |  |  |  |
Accident Year 2020 [Member] |  |  |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | $ 14,005 | 14,561 | 17,107 | 17,485 | $ 20,671 |  |
Shortduration Insurance Contracts Number Of Reported Claims | Claims | 11,556 |  |  |  |  |  |
Accident Year 2021 [Member] |  |  |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | $ 22,404 | 24,484 | 25,337 | $ 28,982 |  |  |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 2,000 |  |  |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | Claims | 14,200 |  |  |  |  |  |
Accident Year 2022 [Member] |  |  |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | $ 27,698 | 28,436 | $ 27,570 |  |  |  |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 3,540 |  |  |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | Claims | 13,176 |  |  |  |  |  |
Accident Year 2023 [Member] |  |  |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | $ 25,611 | $ 25,396 |  |  |  |  |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 5,912 |  |  |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | Claims | 14,073 |  |  |  |  |  |
Accident Year 2024 [Member] |  |  |  |  |  |  |
Incurred claims development [Abstract] |  |  |  |  |  |  |
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net | $ 30,293 |  |  |  |  |  |
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net | $ 9,993 |  |  |  |  |  |
Shortduration Insurance Contracts Number Of Reported Claims | Claims | 12,816 |  |  |  |  |  |

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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://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9E Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4E Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4D -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4D + Details
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