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Condensed Financial Information of AMERCO, Statements of Cash Flow, Parenthetical (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Income taxes paid, net: |  |  |
Income taxes paid (net of income tax refunds) | $ 195,072 us-gaap_IncomeTaxesPaidNet | $ 138,384 us-gaap_IncomeTaxesPaidNet | $ 144,682 us-gaap_IncomeTaxesPaidNet
AMERCO [Member] |  |  |
Income taxes paid, net: |  |  |
Income taxes paid (net of income tax refunds) | $ 195,100 us-gaap_IncomeTaxesPaidNet / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember | $ 138,400 us-gaap_IncomeTaxesPaidNet / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember | $ 144,700 us-gaap_IncomeTaxesPaidNet / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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