Policy Liabilities - Schedule of Weighted Average Duration of Liability For Future Policy Benefits (Details)	Mar. 31, 2026	Mar. 31, 2025
Life \| American Income
Liability for Future Policy Benefit, Activity [Line Items]
At original discount rates	22 years 2 months 8 days	22 years 8 months 1 day
At current discount rates	21 years 11 months 1 day	22 years 7 months 2 days
Life \| DTC
Liability for Future Policy Benefit, Activity [Line Items]
At original discount rates	18 years 6 months 21 days	19 years 2 months 1 day
At current discount rates	19 years 2 months 23 days	20 years 1 month 9 days
Life \| Liberty National
Liability for Future Policy Benefit, Activity [Line Items]
At original discount rates	15 years 3 months 3 days	15 years 3 months 25 days
At current discount rates	14 years 11 months 19 days	15 years 3 months 7 days
Life \| Other
Liability for Future Policy Benefit, Activity [Line Items]
At original discount rates	15 years 5 months 23 days	15 years 10 months 24 days
At current discount rates	15 years 11 months 26 days	16 years 8 months 26 days
Health \| United American
Liability for Future Policy Benefit, Activity [Line Items]
At original discount rates	12 years 5 months 1 day	11 years 8 months 12 days
At current discount rates	11 years 18 days	10 years 7 months 6 days
Health \| Family Heritage
Liability for Future Policy Benefit, Activity [Line Items]
At original discount rates	16 years 2 months 26 days	15 years 3 months 21 days
At current discount rates	14 years 9 months 3 days	14 years 1 month 28 days
Health \| American Income
Liability for Future Policy Benefit, Activity [Line Items]
At original discount rates	13 years 2 months 26 days	12 years 5 months 19 days
At current discount rates	13 years 10 days	12 years 6 months
Health \| DTC
Liability for Future Policy Benefit, Activity [Line Items]
At original discount rates	12 years 5 months 1 day	11 years 8 months 12 days
At current discount rates	11 years 18 days	10 years 7 months 6 days
Health \| Liberty National
Liability for Future Policy Benefit, Activity [Line Items]
At original discount rates	9 years 7 months 2 days	9 years 4 months 13 days
At current discount rates	9 years 3 months 25 days	9 years 2 months 26 days