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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 | 3 Months Ended
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Jun. 30, 2014
Sac Holdings, Four Sac, Five Sac, Galaxy, and Private Mini [Member] |
Related party costs and expenses: |
Revenue, excluding dealer agreement commissions and expenses | $ 8.2
Revenue, generated by the dealer agreement from related parties | 65.6
Commission expenses, generated from dealer agreement with related parties | 14.3
Expenses, related parties | 0.7
Cash flow, related party | $ 9.4

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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
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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
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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
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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
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | duration

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- Details
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Period Type: | duration