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Related Party Transactions (Related Party Costs and Expenses) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Related Party Cost and Expense [Abstract] |  |  |
Related party expenses, total | $ 59,853 | $ 57,368 | $ 54,709
Sac Holdings [Member] |  |  |
Related Party Cost and Expense [Abstract] |  |  |
U-Haul lease expenses | 2,740 | 2,648 | 2,618
U-Haul commission expenses | 53,334 | 51,036 | 48,833
Private Mini [Member] |  |  |
Related Party Cost and Expense [Abstract] |  |  |
U-Haul commission expenses | $ 3,779 | $ 3,684 | $ 3,258

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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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- 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=6453985&loc=d3e41499-112717 + Details
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- Definition Amount of general and administrative expense classified as other. + 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 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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