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Related Party Transactions (Narratives) (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Property Management Fee [Abstract] |  |
Property Management Fee Revenue | $ 19.4 | $ 19.5
Sac Holdings [Member] |  |
Related party costs and expenses: |  |
Revenue generated by the dealer agreement from related parties | 19.2 | 19.1
Commission expenses, generated from dealer agreement with related parties | 4.2 | 3.8
Cash flow, related party | 18.1 | 18.2
Private Mini [Member] |  |
Related party costs and expenses: |  |
Commission expenses, generated from dealer agreement with related parties | $ 60.7 | 59.6
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: |  |
Cash flow, related party | $ 291.9 | $ 289.6

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