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Contingent Liabilities and Commitments (Narratives) (Details) $ in Millions | 12 Months Ended
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Mar. 31, 2016 USD ($)
Commitments and Contingencies Disclosure [Abstract] |
Lease Expiration Year | 2019
Guaranteed residual value | $ 22.3
Started Leasing Equipment 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
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Namespace Prefix: | uhal_
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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
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Namespace Prefix: | uhal_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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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=7662307&loc=d3e42840-112730 + Details
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