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v3.23.3

Related Party Transactions (Related Party Assets) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Mar. 31, 2023
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Related party assets: |  |
Related party assets | $ 40,140 | $ 48,308
Blackwater [Member] |  |
Related party assets: |  |
Amounts due to related parties | 37,791 | 42,141
Mercury [Member] |  |
Related party assets: |  |
Amounts due to related parties | 6,654 | 8,402
Insurance Group [Member] |  |
Related party assets: |  |
Amounts due to related parties | $ (4,305) | $ (2,235)

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- Definition Amounts due to related parties, current. + References No definition available. + Details
Name: | uhal_DueToRelatedParties
Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds. + References No definition available. + Details
Name: | uhal_RelatedPartiesAmountsDue
Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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

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

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

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