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Life Insurance Liabilities (Present Value Expected Future Policy Benefits) (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward] |  |  |  |
Liability For Claims And Claims Adjustment Expense | $ 900,302 | $ 833,632 |  |
Moving and Storage Consolidations [Member] |  |  |  |
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward] |  |  |  |
Liability For Claims And Claims Adjustment Expense | 404,844 | 318,669 |  |
Property and Casualty Insurance [Member] |  |  |  |
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward] |  |  |  |
Liability For Claims And Claims Adjustment Expense | 126,507 | 132,264 |  |
Life Insurance Segment [Member] |  |  |  |
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward] |  |  |  |
Balance, beginning of year | 182,658 | 205,389 |  |
Beginning balance at original discount rate | 185,508 | 204,306 |  |
Effect of actual variances from expected experience |  |  | $ 731 | $ 1,393
Adjusted beginning of year balance |  |  | $ 486,357 | $ 512,720
Issuances | 2,410 | 4,780 |  |
Interest accrual | 4,403 | 4,998 |  |
Net premium collected | 30,450 | 26,560 |  |
Ending balance at original discount rate | 171,579 | 194,972 |  |
Effect of changes in discount rate assumptions (AOCI) | 1,269 | 10,313 |  |
Balance, end of the year | 471,383 | 493,214 |  |
End of period, LFPB, net | 299,511 | 302,332 |  |
Life Insurance Segment [Member] | Oxford |  |  |  |
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward] |  |  |  |
Liability For Claims And Claims Adjustment Expense | 368,951 | 382,699 |  |
Payout annuities and market risk benefits |  |  |  |
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward] |  |  |  |
Liability For Future Policy Benefits | 22,818 | 24,448 |  |
Health Insurance Product Line [Member] |  |  |  |
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward] |  |  |  |
Liability For Future Policy Benefits | 10,179 | 17,238 |  |
Life and annuity claims in course of settlement and claims incurred but not yet reported / Reinsurance losses payable |  |  |  |
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward] |  |  |  |
Liability For Future Policy Benefits | 28,229 | 28,952 |  |
Life DPL / Other life and health |  |  |  |
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward] |  |  |  |
Liability For Future Policy Benefits | $ 8,214 | 9,553 |  |
LFPB flooring effect |  |  |  |
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward] |  |  |  |
Liability For Future Policy Benefits |  | $ 176 |  |

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- Definition Future policy benefit before reinsurance and adjustments, liabilities. + References No definition available. + Details
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- Definition Amount, before tax, of accumulated other comprehensive income (loss) (AOCI) from (increase) decrease in expected future policy benefit component of liability for future policy benefit from change in discount rate. + References Reference 1: 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 Reference 2: 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 3: 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 4: 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 + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-11 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-7 Reference 3: 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 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (cc) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(13)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition Amount of cumulative increase (decrease) in expected future policy benefit and expense component for liability of future policy benefit from effect of variance from cash flow assumption change for actual experience. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 2: 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 Reference 3: 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 4: 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 5: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-13I + Details
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