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Derivatives (Interest rate swap agreements) (Details) - Swap Agreement Seventeen [Member] $ in Millions | 9 Months Ended
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Dec. 31, 2019 USD ($)
Swaps: |
Debt instrument, face amount | $ 0.0
Derivative, Inception Date | Jan. 11, 2013
Derivative Effective Date | Jan. 15, 2013
Derivative, Maturity Date | Dec. 15, 2019
Designated Cash Flow Hedge Date | Jan. 11, 2013

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- Definition The date the derivative agreement becomes effective. This date differs from the agreement date. + References No definition available. + Details
Name: | uhal_DerivativeEffectiveDate
Namespace Prefix: | uhal_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Date the derivative is designated as a cash flow hedge. + References No definition available. + Details
Name: | uhal_DesignatedCashFlowHedgeDate
Namespace Prefix: | uhal_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Date the entity entered into the derivative contract, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DerivativeInceptionDates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DerivativeMaturityDates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=uhal_SwapAgreementSeventeenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |