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Condensed Consolidated Balance Sheets Parenthetical - $ / shares | Dec. 31, 2022 | Mar. 31, 2022
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Series Preferred Stock With or Without Par Value [Member] |  |
Preferred stock: |  |
Preferred stock, shares authorized | 50,000,000 |
Series A Preferred Stock [Member] |  |
Preferred stock: |  |
Preferred stock, shares authorized | 6,100,000 |
Preferred stock, shares issued | 6,100,000 |
Series B Preferred Stock [Member] |  |
Preferred stock: |  |
Preferred stock, shares authorized | 100,000 |
Serial Common Stock With or Without Par Value [Member] |  |
Preferred stock: |  |
Preferred stock, shares authorized | 250,000,000 | 10,000,000
Preferred stock, no par value | $ 0.25 |
Serial Common Stock [Member] |  |
Common stock: |  |
Common stock, shares authorized | 250,000,000 |
Common stock, par or stated value per share | $ 0.25 |
Amerco Common Stock [Member] |  |
Common stock: |  |
Common stock, shares authorized | 250,000,000 |
Common stock, shares, issued | 41,985,700 |
Common stock, shares, outstanding | 19,607,788 |
Common stock, par or stated value per share | $ 0.25 |
Nonvoting Common Stock [Member] |  |
Common stock: |  |
Common stock, shares authorized | 250,000,000 |
Common stock, shares, issued | 176,470,092 |
Common stock, par or stated value per share | $ 0.001 |
Common Stock in Treasury [Member] |  |
Treasury stock: |  |
Treasury stock, shares | 22,377,912 |
Preferred Stock in Treasury [Member] |  |
Treasury stock: |  |
Treasury stock, shares | 6,100,000 |

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