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Related Party Transactions (Related Party Costs and Expenses) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016
Related party cost and expense: |  |
Related party expenses, total | $ 16,567 | $ 16,441
Sac Holdings [Member] |  |
Related party cost and expense: |  |
U-Haul lease expenses | 681 | 688
U-Haul commission expenses | 14,926 | 14,701
Private Mini [Member] |  |
Related party cost and expense: |  |
U-Haul commission expenses | $ 960 | $ 1,052

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- Definition Costs of sales and operating expenses for the period incurred from transactions with related parties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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