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Life Insurance Liability (Sensitive Life Insurance Type Products) (Details)
$ in Thousands
 12 Months Ended
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Liability for Future Policy Benefit, Activity [Line Items]      
Interest expense $ 295,716 $ 256,175 $ 223,958
Life Insurance Segment [Member]      
Liability for Future Policy Benefit, Activity [Line Items]      
Gross premiums $ 49,429 $ 52,909  
Expected future lifetime (persistency) of policies in force (years)   6 years 9 months 18 days  
Weighted average original interest rate of the liability for future policy benefits 4.96% 4.99%  
Weighted average current interest rate of the liability for future policy benefits 4.99% 5.03%  
Life Insurance Segment [Member] | Oxford      
Liability for Future Policy Benefit, Activity [Line Items]      
Interest expense $ 15,253 $ 15,322  
Expected gross premiums: | Life Insurance Segment [Member]      
Liability for Future Policy Benefit, Activity [Line Items]      
Undiscounted balance 341,117 367,640  
Discounted balance at original discount rate 264,878 285,087  
Discounted balance at current discount rate 260,455 286,295  
Expected policy benefits: | Life Insurance Segment [Member]      
Liability for Future Policy Benefit, Activity [Line Items]      
Undiscounted balance 704,682 742,927  
Discounted balance at original discount rate 490,975 514,112  
Discounted balance at current discount rate $ 482,805 $ 522,121  
Lapses actual experience | Life Insurance Segment [Member]      
Liability for Future Policy Benefit, Activity [Line Items]      
Market Risk Benefit, Measurement Input 0.0483 0.0449  
Mortality expected experience | Life Insurance Segment [Member]      
Liability for Future Policy Benefit, Activity [Line Items]      
Market Risk Benefit, Measurement Input 0.054 0.0506  
Lapses actual experience | Life Insurance Segment [Member]      
Liability for Future Policy Benefit, Activity [Line Items]      
Market Risk Benefit, Measurement Input 0.0228 0.021  
Lapses expected experience | Life Insurance Segment [Member]      
Liability for Future Policy Benefit, Activity [Line Items]      
Market Risk Benefit, Measurement Input 0.027 0.0263