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Life Insurance Liabilities (Present Value Expected Future Policy Benefits) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Mar. 31, 2025
Mar. 31, 2024
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward]        
Liability For Claims And Claims Adjustment Expense $ 900,302 $ 833,632    
Moving and Storage Consolidations [Member]        
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward]        
Liability For Claims And Claims Adjustment Expense 404,844 318,669    
Property and Casualty Insurance [Member]        
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward]        
Liability For Claims And Claims Adjustment Expense 126,507 132,264    
Life Insurance Segment [Member]        
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward]        
Balance, beginning of year 182,658 205,389    
Beginning balance at original discount rate 185,508 204,306    
Effect of actual variances from expected experience     $ 731 $ 1,393
Adjusted beginning of year balance     $ 486,357 $ 512,720
Issuances 2,410 4,780    
Interest accrual 4,403 4,998    
Net premium collected 30,450 26,560    
Ending balance at original discount rate 171,579 194,972    
Effect of changes in discount rate assumptions (AOCI) 1,269 10,313    
Balance, end of the year 471,383 493,214    
End of period, LFPB, net 299,511 302,332    
Life Insurance Segment [Member] | Oxford        
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward]        
Liability For Claims And Claims Adjustment Expense 368,951 382,699    
Payout annuities and market risk benefits        
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward]        
Liability For Future Policy Benefits 22,818 24,448    
Health Insurance Product Line [Member]        
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward]        
Liability For Future Policy Benefits 10,179 17,238    
Life and annuity claims in course of settlement and claims incurred but not yet reported / Reinsurance losses payable        
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward]        
Liability For Future Policy Benefits 28,229 28,952    
Life DPL / Other life and health        
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward]        
Liability For Future Policy Benefits $ 8,214 9,553    
LFPB flooring effect        
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward]        
Liability For Future Policy Benefits   $ 176