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Related Party Transactions (Related Party Assets) Parenthetical (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Related Party Transaction, Due from (to) Related Party [Abstract] |  |
Dividend from related party | $ 18,599 | $ 0
Insurance group |  |
Related Party Transaction, Due from (to) Related Party [Abstract] |  |
Dividend from related party | $ 18,600 |

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- Definition The cash inflow from an entity that is affiliated with the entity by means of direct or indirect ownership. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionDueFromToRelatedPartyAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=uhal_InsuranceGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |