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Dividends Paid to Stockholders' by Insurance Companies Domiciled in the State of Arizona (Details) (Operating Segments [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2013 | Mar. 31, 2014
Property and Casualty Insurance [Member] | Repwest [Member] |  |  |
Statutory financial information of insurance subsidiaries: |  |  |
Statutory accounting practices, statutory amount available for dividend payments | $ 15.6 us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = uhal_PropertyAndCasualtyInsuranceMember / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_RepwestMember |  |
Dividend payments restrictions schedule, amounts paid |  |  |
Life Insurance [Member] | Oxford [Member] |  |  |
Statutory financial information of insurance subsidiaries: |  |  |
Statutory accounting practices, statutory amount available for dividend payments |  |  | 12.1 us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = uhal_LifeInsuranceMember / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_OxfordMember
Dividend payments restrictions schedule, amounts paid |  |  |

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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 + Details
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- Definition Amount of dividends available for payment after computation of statutory restrictions on capital surplus. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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