Policyholders' Liabilities - Liability for Future Policy Benefit, Discounted Undiscounted Activity (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Life Insurance, Permanent
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	$ 841,337	$ 731,580
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	1,650,874	1,586,017
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	630,663	564,242
Expected future benefit payments	1,027,678	1,030,904
Life Insurance, Permanent Limited Pay
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	50,368	46,270
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	337,949	322,188
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	45,453	41,999
Expected future benefit payments	193,339	195,610
Home Service Insurance, Life Insurance, Permanent
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	440,922	448,837
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	495,085	487,851
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	262,157	272,938
Expected future benefit payments	206,198	212,887
Home Service Insurance, Life Insurance, Permanent Limited Pay
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	75,656	76,032
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	323,121	320,318
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	49,168	51,752
Expected future benefit payments	$ 114,544	$ 120,606

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
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-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/exampleRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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