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Related Party Transactions (Narratives) (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Sac Holdings [Member] |  |
Related party costs and expenses: |  |
Commission expenses, generated from dealer agreement with related parties | $ 5.7 | $ 1.8
Cash flow, related party | 26.5 | 20.9
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] |  |
Property Management Fee [Abstract] |  |
Property Management Fee Revenue | $ 28.5 | 25.0
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] | Minimum [Member] |  |
Property Management Fee [Abstract] |  |
Management fee rate | 4.00% |
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] | Maximum [Member] |  |
Property Management Fee [Abstract] |  |
Management fee rate | 10.00% |
Sac Holdings, Four Sac, Five Sac, Galaxy, and Private Mini [Member] |  |
Related party costs and expenses: |  |
Revenue generated by the dealer agreement from related parties | $ 408.6 | 305.2
Commission expenses, generated from dealer agreement with related parties | 84.3 |
Payments For Purchase Of Other Assets 1 |  | 0.7
Various Subsidiaries of Amerco [Member] |  |
Related party costs and expenses: |  |
Revenue generated by the dealer agreement from related parties | $ 28.0 | $ 22.6

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