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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2025
Mar. 31, 2024
Condensed Balance Sheet Statements, Captions [Line Items]    
Available for sale investments, allowance for credit loss, net $ 3,104 $ 1,052
Debt Securities, Available-for-Sale, Amortized Cost, Current $ 2,708,562 $ 2,660,093
Series Preferred Stock With or Without Par Value [Member]    
Preferred stock:    
Preferred stock, shares authorized 50,000,000 50,000,000
Series A Preferred Stock [Member]    
Preferred stock:    
Preferred stock, shares authorized 6,100,000 6,100,000
Preferred stock, shares issued 6,100,000 6,100,000
Series B Preferred Stock [Member]    
Preferred stock:    
Preferred stock, shares authorized 100,000 100,000
Serial Common Stock With or Without Par Value [Member]    
Common stock:    
Common stock, shares authorized 250,000,000 250,000,000
Common stock, par or stated value per share $ 0.25 $ 0.25
Serial Common Stock [Member]    
Common stock:    
Common stock, shares authorized 10,000,000 10,000,000
Common Stock [Member]    
Common stock:    
Common stock, shares authorized 250,000,000 250,000,000
Common stock, par or stated value per share $ 0.25 $ 0.25
Amerco Common Stock [Member]    
Common stock:    
Common stock, shares authorized 250,000,000 250,000,000
Common stock, shares, issued 41,985,700 41,985,700
Common stock, shares, outstanding 19,607,788 19,607,788
Common stock, par or stated value per share $ 0.25 $ 0.25
Nonvoting Common Stock [Member]    
Common stock:    
Common stock, shares authorized 250,000,000 250,000,000
Common stock, shares, outstanding 176,470,092 176,470,092
Common stock, par or stated value per share $ 0.001 $ 0.001
Common Stock in Treasury [Member]    
Treasury stock:    
Treasury Stock Common Shares 22,377,912 22,377,912
Preferred Stock in Treasury [Member]    
Treasury stock:    
Treasury Stock Common Shares 6,100,000 6,100,000