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Employee Benefit Plans (Narratives) (Details) - USD ($) | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Compensation of related costs, Share-based Payments [Abstract] |  |  |
Employee stock ownership plan (ESOP), compensation expense | $ 22,100,000 | $ 23,000,000.0 | $ 23,000,000.0
Cash contributions to ESOP non leveraged | $ 22,100,000 | $ 23,000,000.0 | $ 23,000,000.0
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract] |  |  |
Defined benefit plan, health care cost trend rate assumed for next fiscal year | 6.00% |  |
Defined benefit plan, ultimate health care cost trend rate | 4.00% |  |
Post retirement health insurance [Member] |  |  |
Deferred Compensation Arrangements [Abstract] |  |  |
Lifetime maximum benefit paid per individual | $ 20,000 |  |
Post retirement life insurance [Member] |  |  |
Deferred Compensation Arrangements [Abstract] |  |  |
Lifetime maximum benefit paid per individual | 3,000 |  |
Additional benefit requirement amount | $ 100 |  |

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- Definition Additional amount provided to retiree's for each year of server over ten years. + References No definition available. + Details
Name: | uhal_AdditionalBenefitRequirementAmount
Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition This item represents the non leveraged amount of cash contributions during the period made by the entity to the Employee Stock Ownership Plan (ESOP). + References No definition available. + Details
Name: | uhal_EmployeeStockOwnershipPlanEsopCashContributionsToEsopNonLeveraged
Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The maximum amount an individual receives as an insurance benefit after completing the requisite number of years of service and having reached the requisite age. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

X
- Definition Ultimate trend rate for health care cost for defined benefit postretirement plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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Balance Type: | na
Period Type: | instant

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

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- Definition The amount of plan compensation cost recognized during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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- Details
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