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Subsequent Events (Narratives) (Details) - Subsequent Event [Member] - Capital Additions [Member] $ in Millions | Apr. 26, 2017 USD ($)
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Subsequent Events [Abstract] |
Pledged Assets Not Separately Reported Real Estate Tax Free Exchange | $ 200.0
Real Estate Held For Sale | $ 5.0

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- Definition The sale amount of property in purchase and sale agreement of real estate owned but transferred to serve as collateral in tax free exchange. + References No definition available. + Details
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Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |