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Related Party Transactions (Related Party Costs and Expenses) (Details) - Blackwater [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Related party cost and expense: |  |  |  |
U-Haul lease expenses | $ 658 | $ 670 | $ 1,316 | $ 1,340
U-Haul commission expenses | $ 18,617 | $ 18,348 | $ 35,819 | $ 34,833

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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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