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Contingent Liabilities And Commitments (Narratives) (Details) $ in Millions | 3 Months Ended
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Jun. 30, 2017 USD ($)
Operating leases, rental equipment [Abstract] |
Lease expiration year | 2019
Guaranteed residual value | $ 16.5
Lease equipment start date | 1987

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- Definition We provide the expiration year on our rental equipment, not the complete date. + References No definition available. + Details
Name: | uhal_LeaseExpirationYear
Namespace Prefix: | uhal_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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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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- References No definition available. + Details
Name: | us-gaap_LeasesOperatingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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 Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 30 -Paragraph 14 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=77895730&loc=d3e42840-112730 + Details
Name: | us-gaap_LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureResidualValueOfLeasedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant