Policy Liabilities - Schedule of Weighted Average Duration of Liability For Future Policy Benefits (Details)	Mar. 31, 2025	Mar. 31, 2024
Life | American Income
Liability for Future Policy Benefit, Activity [Line Items]
At original discount rates	22 years 8 months 1 day	23 years 18 days
At current discount rates	22 years 7 months 2 days	23 years 3 months 29 days
Life | DTC
Liability for Future Policy Benefit, Activity [Line Items]
At original discount rates	19 years 2 months 1 day	19 years 6 months 25 days
At current discount rates	20 years 1 month 9 days	21 years 3 days
Life | Liberty National
Liability for Future Policy Benefit, Activity [Line Items]
At original discount rates	15 years 3 months 25 days	15 years 1 month 28 days
At current discount rates	15 years 3 months 7 days	15 years 7 months 6 days
Life | Other premium
Liability for Future Policy Benefit, Activity [Line Items]
At original discount rates	15 years 10 months 24 days	16 years 2 months 4 days
At current discount rates	16 years 8 months 26 days	17 years 7 months 2 days
Health | American Income
Liability for Future Policy Benefit, Activity [Line Items]
At original discount rates	12 years 5 months 19 days	12 years 3 months 10 days
At current discount rates	12 years 6 months	12 years 8 months 1 day
Health | DTC
Liability for Future Policy Benefit, Activity [Line Items]
At original discount rates	11 years 8 months 12 days	11 years 6 months 10 days
At current discount rates	10 years 7 months 6 days	10 years 8 months 26 days
Health | Liberty National
Liability for Future Policy Benefit, Activity [Line Items]
At original discount rates	9 years 4 months 13 days	9 years 2 months 23 days
At current discount rates	9 years 2 months 26 days	9 years 4 months 20 days
Health | United American
Liability for Future Policy Benefit, Activity [Line Items]
At original discount rates	11 years 8 months 12 days	11 years 6 months 10 days
At current discount rates	10 years 7 months 6 days	10 years 8 months 26 days
Health | Family Heritage
Liability for Future Policy Benefit, Activity [Line Items]
At original discount rates	15 years 3 months 21 days	15 years 25 days
At current discount rates	14 years 1 month 28 days	14 years 4 months 2 days