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Policyholders' Liabilities - Liabilities for Future Policy Benefits, Weighted Average (Details) | Mar. 31, 2025 | Mar. 31, 2024
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Life Insurance, Permanent |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Weighted-Average Duration, Original Discount | 8 years 6 months | 8 years 2 months 12 days
Liability for Future Policy Benefit, Weighted-Average Duration | 8 years 7 months 6 days | 8 years 6 months
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate | 4.86% | 4.89%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate | 5.13% | 5.10%
Life Insurance, Permanent Limited Pay |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Weighted-Average Duration, Original Discount | 8 years | 8 years 1 month 6 days
Liability for Future Policy Benefit, Weighted-Average Duration | 7 years 7 months 6 days | 7 years 9 months 18 days
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate | 4.25% | 4.28%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate | 5.15% | 5.09%
Home Service Insurance, Life Insurance, Permanent |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Weighted-Average Duration, Original Discount | 15 years 2 months 12 days | 16 years
Liability for Future Policy Benefit, Weighted-Average Duration | 14 years 6 months | 15 years 9 months 18 days
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate | 4.82% | 4.97%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate | 5.49% | 5.31%
Home Service Insurance, Life Insurance, Permanent Limited Pay |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Weighted-Average Duration, Original Discount | 13 years 8 months 12 days | 14 years 6 months
Liability for Future Policy Benefit, Weighted-Average Duration | 13 years 3 months 18 days | 14 years 6 months
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate | 4.87% | 5.03%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate | 5.47% | 5.31%

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- Definition Weighted-average duration of liability for future policy benefit at original discount rate, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact for one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(6) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(5) -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)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 6: 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 7: 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 8: 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 Reference 9: 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 10: 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 + Details
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