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Rental Equipment Operating Leases (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Jun. 30, 2012
Contingent liabilities and commitments: |
Guaranteed residual value | 132.4
Rental equipment |
Contingent liabilities and commitments: |
Lease expiration date | 2019
Started leasing equipment date | 1987

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- Definition AMERCO has been leasing equipment for several decades with no material losses relating to these types of residual value guarantees. This provides the original date when the Company started leasing. + References No definition available. + Details
Name: | uhal_StartedLeasingEquipmentDate
Namespace Prefix: | uhal_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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- Definition The date upon which a lease or a group of leases is set to expire. + References No definition available. + Details
Name: | us-gaap_LeaseExpirationDate
Namespace Prefix: | us-gaap_
Data Type: | us-types:dateStringItemType
Balance Type: | na
Period Type: | duration

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- Definition The estimate of the value of the leased asset at the end of the lease term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 30 -Paragraph 14 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6791857&loc=d3e42840-112730 + Details
Name: | us-gaap_LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureResidualValueOfLeasedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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