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Life Insurance Liability (Present Value Expected Future Policy Benefits) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Total $ 857,521 $ 849,113  
Life Insurance Segment [Member]      
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Total 368,900    
Life Insurance Segment [Member] | Oxford      
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Balance, beginning of year 522,122 530,984  
Beginning balance at original discount rate 514,113 533,689  
Effect of actual variances from expected experience   483 $ 932
Adjusted beginning of year balance   509,569 $ 531,206
Issuances 9,278 8,513  
Interest accrual 25,275 26,507  
Net premium collected 53,147 52,113  
Ending balance at original discount rate 490,975 514,113  
Effect of changes in discount rate assumptions (AOCI) 8,170 8,009  
Balance, end of the year 482,805 522,122  
End of period, LFPB, net 300,147 316,733  
Payout annuities and market risk benefits 24,523 31,337  
Life and annuity ICOS and IBNR / Reinsurance losses payable 25,426 27,432  
Life DPL, Other life and health 8,686 9,208  
End of period balance, Oxford 368,914 396,918  
Balance, Moving and Storage 361,755 319,716  
Balance, Property and Casualty $ 126,852 $ 132,479