Policyholders' Liabilities - Liability for Future Policy Benefit, Discounted Undiscounted Activity (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Life Insurance, Permanent
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	$ 658,547	$ 607,319
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	1,514,326	1,478,777
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	499,821	474,777
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change	958,772	965,720
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	46,558	46,845
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	326,302	321,985
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	41,378	41,719
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change	189,844	197,673
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	455,252	463,491
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	488,264	478,978
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	268,852	277,098
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change	204,856	205,841
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	76,799	77,743
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	320,554	319,390
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	51,413	54,170
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change	$ 116,909	$ 119,104