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Related Party Transactions (Narratives) (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] |  |
Property Management Fee [Abstract] |  |
Property Management Fee Revenue | $ 16.3 | $ 17.4
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 | $ 12.6 |
Expenses, related parties | 1.3 |
Cash flow, related party | 11.3 |
Revenue generated by the dealer agreement from related parties | 169.6 |
Commission expenses, generated from dealer agreement with related parties | $ 35.8 |

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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