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Related Party Costs and Expenses [Text] (Details) (SAC Holdings, Four SAC, Five SAC, Galaxy, and Private Mini [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015
SAC Holdings, Four SAC, Five SAC, Galaxy, and Private Mini [Member] |
Related party costs and expenses: |
Revenue, excluding dealer agreement commissions and expenses | $ 31.9 uhal_RevenueExcludingDealerAgreementCommissionsAndExpenses / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SACHoldingsFourSACFiveSACGalaxyPrivateMiniMember
Revenue, generated by the dealer agreement from related parties | 241.3 us-gaap_ContractsRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SACHoldingsFourSACFiveSACGalaxyPrivateMiniMember
Commission expenses, generated from dealer agreement with related parties | 52.1 uhal_CommissionExpensesGeneratedFromDealerAgreementWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SACHoldingsFourSACFiveSACGalaxyPrivateMiniMember
Expenses, related parties | 2.6 uhal_SacHoldingsLeaseAndRentalExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SACHoldingsFourSACFiveSACGalaxyPrivateMiniMember
Cash flow, related party | $ 60.0 uhal_CashGeneratedFromAgreementsAndNotes / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SACHoldingsFourSACFiveSACGalaxyPrivateMiniMember

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- Definition Cash generated from agreements and notes with SAC Holdings, Four SAC, Five SAC, Galaxy and Private Mini, excluding Dealer Agreements. + References No definition available. + Details
Name: | uhal_CashGeneratedFromAgreementsAndNotes
Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition These agreements and notes with subsidiaries of SAC Holdings, 4 SAC, 5 SAC, Galaxy and Private Mini, Excluded Dealer Agreements commission expenses. + References No definition available. + Details
Name: | uhal_CommissionExpensesGeneratedFromDealerAgreementWithRelatedParty
Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of revenue received excluding any revenue generated from dealer commissions or expenses as part of the dealer contract between the Company and these related party entities. + References No definition available. + Details
Name: | uhal_RevenueExcludingDealerAgreementCommissionsAndExpenses
Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This provides just the cost and expense for SAC holdings. + References No definition available. + Details
Name: | uhal_SacHoldingsLeaseAndRentalExpense
Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product. + 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 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_ContractsRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_SupplementalIncomeStatementElementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration