v3.25.4
Life Insurance Liabilities (Sensitive Life Insurance Type Products) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Liability for Future Policy Benefit, after Reinsurance [Abstract]        
Interest expense $ 95,527,000 $ 76,581,000 $ 268,162,000 $ 215,297,000
Life Insurance Segment [Member] | Oxford        
Liability for Future Policy Benefit, after Reinsurance [Abstract]        
Gross premiums $ 34,519,000 $ 37,561,000 34,519,000 37,561,000
Interest expense     $ 11,115,000 $ 11,402,000
Expected future lifetime (persistency) of policies in force (years) 6 years 8 months 12 days 6 years 9 months 18 days 6 years 8 months 12 days 6 years 9 months 18 days
Weighted average original interest rate of the liability for future policy benefits 4.90% 4.97% 4.90% 4.97%
Weighted average current interest rate of the liability for future policy benefits 4.28% 5.20% 4.28% 5.20%
Life Insurance Segment [Member] | Oxford | Expected gross premiums:        
Liability for Future Policy Benefit, after Reinsurance [Abstract]        
Undiscounted balance $ 309,987,000 $ 348,354,000 $ 309,987,000 $ 348,354,000
Discounted balance at original discount rate 240,279,000 270,029,000 240,279,000 270,029,000
Discounted balance at current discount rate 242,432,000 274,428,000 242,432,000 274,428,000
Life Insurance Segment [Member] | Oxford | Expected policy benefits:        
Liability for Future Policy Benefit, after Reinsurance [Abstract]        
Undiscounted balance 665,628,000 714,265,000 665,628,000 714,265,000
Discounted balance at original discount rate 463,993,000 496,385,000 463,993,000 496,385,000
Discounted balance at current discount rate $ 469,419,000 $ 510,163,000 $ 469,419,000 $ 510,163,000
Life Insurance Segment [Member] | Oxford | Lapses actual experience        
Liability for Future Policy Benefit, after Reinsurance [Abstract]        
Market Risk Benefit Measurement Input 0.0653 0.0489 0.0653 0.0489
Life Insurance Segment [Member] | Oxford | Mortality expected experience        
Liability for Future Policy Benefit, after Reinsurance [Abstract]        
Market Risk Benefit Measurement Input 0.0658 0.0543 0.0658 0.0543
Life Insurance Segment [Member] | Oxford | Lapses actual experience        
Liability for Future Policy Benefit, after Reinsurance [Abstract]        
Market Risk Benefit Measurement Input 0.0214 0.0218 0.0214 0.0218
Life Insurance Segment [Member] | Oxford | Lapses expected experience        
Liability for Future Policy Benefit, after Reinsurance [Abstract]        
Market Risk Benefit Measurement Input 0.031 0.0272 0.031 0.0272