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Related Party Transactions (Narratives) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] |  |  |  |
Related party notes receivable: |  |  |  |
Cash interest payments |  |  | $ 4.0 |
Property Management Fee [Abstract] |  |  |  |
Property Management Fee Revenue |  |  | $ 24.9 | $ 27.1
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% |
Various Subsidiaries of Amerco [Member] | Sac Holdings, Four Sac, Five Sac, Galaxy, and Private Mini [Member] |  |  |  |
Related party costs and expenses: |  |  |  |
Revenue, excluding dealer agreement commissions and expenses | $ 22.7 | $ 21.6 |  |
Expenses, related parties | $ 1.8 | $ 1.8 |  |
Cash flow, related party |  |  | $ 21.0 | 19.8
Revenue generated by the dealer agreement from related parties |  |  | 339.5 | 335.3
Commission expenses, generated from dealer agreement with related parties |  |  | $ 71.3 | $ 70.5

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