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Related Party Transactions (Narratives) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Related party notes receivable: |  |  |
One time cash interest proceeds | $ 4.0 |  |
Property Management Fee [Abstract] |  |  |
Management fees received exclusive of reimbursed expenses | $ 37.0 | $ 38.5 | $ 31.2
Minimum [Member] |  |  |
Property Management Fee [Abstract] |  |  |
Management fee rate | 4.00% |  |
Maximum [Member] |  |  |
Property Management Fee [Abstract] |  |  |
Management fee rate | 10.00% |  |
Sac Holdings [Member] |  |  |
Related party costs and expenses: |  |  |
Revenue, excluding dealer agreement commissions and expenses | $ 29.8 | 28.5 | 25.5
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] |  |  |
Related party costs and expenses: |  |  |
Expenses, related parties | 2.4 | 2.4 | 2.6
Cash flow, related party | 27.4 | 25.9 | 22.6
Revenue, generated by the dealer agreement from related parties | 418.9 | 417.9 | 323.8
Commission expenses, generated from dealer agreement with related parties | $ 88.1 | $ 88.3 | $ 69.2

X
- Definition Cash generated from agreements and notes with SAC Holdings, Four SAC, Five SAC, Galaxy and Private Mini, excluding Dealer Agreements. + References No definition available. + Details
Name: | uhal_CashGeneratedFromAgreementsAndNotes
Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition These agreements and notes with subsidiaries of SAC Holdings, 4 SAC, 5 SAC, Galaxy and Private Mini, Excluded Dealer Agreements commission expenses. + References No definition available. + Details
Name: | uhal_CommissionExpensesGeneratedFromDealerAgreementWithRelatedParty
Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue earned from products and services provided under the terms of contract, including, but not limited to, government contracts and construction contracts, classified as other. + References No definition available. + Details
Name: | uhal_ContractRevenues
Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition One time interest payment received on loans and other debt instruments. + References No definition available. + Details
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Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition The amount of revenue received excluding any revenue generated from dealer commissions or expenses as part of the dealer contract between the Company and these related party entities. + References No definition available. + Details
Name: | uhal_RevenueExcludingDealerAgreementCommissionsAndExpenses
Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This provides just the cost and expense for SAC holdings. + References No definition available. + Details
Name: | uhal_SacHoldingsLeaseAndRentalExpense
Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition The percentage charged for managing real estate properties. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of revenue derived from managing real estate properties. + References No definition available. + Details
Name: | us-gaap_PropertyManagementFeeRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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