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Policy Benefits And Losses Claims And Loss Expenses Payable (Present Value Expected Net Premiums) (Details) - USD ($) $ in Thousands |  | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 01, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Liability For Future Policy Benefit Expected Net Premium [Roll Forward] |  |  |  |  |  |
Balance, beginning of the year |  |  |  |  |  | $ 123,132
Effect of actual variances from expected variances |  |  |  |  |  | 2,580
Other | $ 464,481 |  |  |  |  |
Effect of changes in discount rate assumptions (AOCI) |  |  |  |  |  | 337,022
Oxford |  |  |  |  |  |
Liability For Future Policy Benefit Expected Net Premium [Roll Forward] |  |  |  |  |  |
Balance, beginning of the year |  | $ 397,316 | $ 488,325 | $ 419,687 | $ 561,103 |
Beginning balance at original discount rate |  | 413,303 | 488,470 | 437,525 | 496,048 |
Effect of changes in cash flow assumptions |  |  |  | 0 | 0 |
Effect of actual variances from expected variances |  |  |  | (5,831) | 1,774 |
Adjust beginning of year balance |  |  |  | 431,694 | 497,822 |
Issuances |  | 5,149 | 16,536 |  |  |
Interest accrual |  | 9,650 | 11,099 |  |  |
Net premium collected |  | (33,190) | (36,987) |  |  |
Other |  | 0 | 0 |  |  |
Ending balance at original discount rate |  | 413,303 | 488,470 |  |  |
Effect of changes in discount rate assumptions (AOCI) |  | (15,987) | (145) |  |  |
Balance, end of period |  | 397,316 | 488,325 |  |  |
Life Insurance Segment [Member] | Oxford |  |  |  |  |  |
Liability For Future Policy Benefit Expected Net Premium [Roll Forward] |  |  |  |  |  |
Balance, beginning of the year |  | 214,027 | 249,477 | 223,118 | 280,371 |
Beginning balance at original discount rate |  | 215,677 | 241,663 | 225,071 | 242,741 |
Effect of changes in cash flow assumptions |  |  |  | 0 | 0 |
Effect of actual variances from expected variances |  |  |  | (187) | 748 |
Adjust beginning of year balance |  |  |  | 224,884 | 243,489 |
Issuances |  | 5,072 | 14,083 |  |  |
Interest accrual |  | 5,554 | 6,037 |  |  |
Net premium collected |  | (19,833) | (21,946) |  |  |
Other |  | 0 | 0 |  |  |
Ending balance at original discount rate |  | 215,677 | 241,663 |  |  |
Effect of changes in discount rate assumptions (AOCI) |  | (1,650) | 7,814 |  |  |
Balance, end of period |  | 214,027 | 249,477 |  |  |
Health Insurance Product Line [Member] |  |  |  |  |  |
Liability For Future Policy Benefit Expected Net Premium [Roll Forward] |  |  |  |  |  |
Balance, beginning of the year |  |  |  |  |  | 4,847
Effect of actual variances from expected variances |  |  |  |  |  | 0
Other | $ 23,188 |  |  |  |  |
Effect of changes in discount rate assumptions (AOCI) |  |  |  |  |  | $ 18,341
Health Insurance Product Line [Member] | Oxford |  |  |  |  |  |
Liability For Future Policy Benefit Expected Net Premium [Roll Forward] |  |  |  |  |  |
Balance, beginning of the year |  | 183,289 | 238,848 | 196,569 | 280,732 |
Beginning balance at original discount rate |  | 197,626 | 246,807 | 212,454 | 253,307 |
Effect of changes in cash flow assumptions |  |  |  | 0 | 0 |
Effect of actual variances from expected variances |  |  |  | (5,644) | 1,026 |
Adjust beginning of year balance |  |  |  | $ 206,810 | $ 254,333 |
Issuances |  | 77 | 2,453 |  |  |
Interest accrual |  | 4,096 | 5,062 |  |  |
Net premium collected |  | (13,357) | (15,041) |  |  |
Other |  | 0 | 0 |  |  |
Ending balance at original discount rate |  | 197,626 | 246,807 |  |  |
Effect of changes in discount rate assumptions (AOCI) |  | (14,337) | (7,959) |  |  |
Balance, end of period |  | $ 183,289 | $ 238,848 |  |  |

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) (AOCI) from increase (decrease) in expected net premium component of liability for future policy benefit from change in discount rate. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-13I Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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- Definition Amount, before effect of reinsurance and after current period update of cash flow assumption and discount rate change, of expected net premium component of liability for future policy benefit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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