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Related Party Transactions (Narratives) (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] |  |
Property Management Fee [Abstract] |  |
Property Management Fee Revenue | $ 27.1 | $ 24.5
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, excluding dealer agreement commissions and expenses | $ 21.6 |
Expenses, related parties | 1.8 |
Cash flow, related party | 19.8 |
Revenue generated by the dealer agreement from related parties | 335.3 |
Commission expenses, generated from dealer agreement with related parties | $ 70.5 |

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