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Related Party Transactions (Related Party Costs and Expenses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Related party cost and expense: |  |  |  |
Related party expenses, total | $ 18,231 | $ 17,812 | $ 34,798 | $ 34,253
Blackwater [Member] |  |  |  |
Related party cost and expense: |  |  |  |
U-Haul lease expenses | 675 | 684 | 1,356 | 1,372
U-Haul commission expenses | $ 17,556 | $ 17,128 | $ 33,442 | $ 32,881

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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://www.xbrl.org/2003/role/presentationRef -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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