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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2024 | Mar. 31, 2024
--- | --- | ---
Available-for-sale Securities [Abstract] |  |
Available for sale investments, allowance for credit loss, net | $ 2,995 | $ 1,052
Debt Securities, Available-for-Sale, Amortized Cost, Current | $ 2,631,881 | $ 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

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