Historic applicable margins. This is the higher of the rate range.

No definition available.

Name:	uhal_ApplicableMarginsHighRate
Namespace Prefix:	uhal_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Historic applicable margin. This is the lower of the rate range.

+ References

No definition available.

+ Details

Name:	uhal_ApplicableMarginsLowRate
Namespace Prefix:	uhal_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The debt agreement amount at the beginning of this contract. It is no longer valid because of a subsequent amendment in the terms of this loan.

+ References

No definition available.

+ Details

Name:	uhal_DebtInstrumentOriginalFaceAmount
Namespace Prefix:	uhal_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Funding percentage of loans.

+ References

No definition available.

+ Details

Name:	uhal_FundingPercentageOfLoans
Namespace Prefix:	uhal_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The DebtInstrumentMaturityDate could have worked for this element, but it must include the format Month-Date-Year. Will use this US-GAAP Element in the next few schedules, when possible, where we break down the various items that make up the Borrowing's narrative.

+ References

No definition available.

+ Details

Name:	uhal_MaturityYear
Namespace Prefix:	uhal_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average remaining lease term for finance lease.

+ References

No definition available.

+ Details

Name:	uhal_RemainingLeaseTermFinanceLeaseWeightedAverage
Namespace Prefix:	uhal_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of corporate (parent company) debt held by our insurance subsidiaries.

+ References

No definition available.

+ Details

Name:	uhal_SubsidiariesShareOfDebtPurchasedFromParent
Namespace Prefix:	uhal_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of increase in lease obligation from new lease.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482913/230-10-50-4

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482913/230-10-50-3

+ Details

Name:	us-gaap_CapitalLeaseObligationsIncurred
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of short-term and long-term debt and lease obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

+ Details

Name:	us-gaap_DebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482900/835-30-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481568/470-20-55-69B

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69C
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481568/470-20-55-69C

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482925/835-30-45-2

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482949/835-30-55-8

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentageAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentageAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_FederalHomeLoanBankAdvancesActivityForYearAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of advances from the Federal Home Loan Bank (FHLB).

+ References

+ Details

Name:	us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 470
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480876/942-470-45-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480848/942-470-50-3

+ Details

Name:	us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_LeaseCostAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtCurrentAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

No definition available.

+ Details

Name:	us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity.

+ References

+ Details

Name:	us-gaap_OtherBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The percentage charged for managing real estate properties.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyManagementFeePercentFee
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying amount of income producing properties held for rental.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(d))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

+ Details

Name:	us-gaap_RentalProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

A description of the terms of the lease(s) related to the assets being leased-back in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 840
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481295/840-40-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-SubTopic 40
-Topic 842
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479741/842-40-50-2

+ Details

Name:	us-gaap_SaleLeasebackTransactionLeaseTerms
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_MortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=srt_ParentCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_MediumTermNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_LongtermDebtTypeAxis=uhal_FinanceLeaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_CapitalLeaseObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=uhal_AmercoRealEstateSubsidiariesAndUhaulCompanyOfFloridaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=uhal_VariousSubsidiariesOfAmercoRealEstateAndUhaulIntlMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=uhal_RentalTruckRevolversMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=uhal_UhaulIntlAndSubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=uhal_UhaulSFleetTwoThousandTenBoxTruckNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_CollateralizedDebtObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=uhal_AmercoUsBankNationalAssociationTrusteeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=uhal_LifeInsuranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=srt_SubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Borrowings (Narratives) (Details) - USD ($)	12 Months Ended
Borrowings (Narratives) (Details) - USD ($)	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Debt instruments, face, payment, and remaining balance amount:
Notes, loans and leases payable	$ 6,271,362,000	$ 6,108,042,000
Debt instruments, issuance and maturity dates:
Remaining Lease Term Finance Lease Weighted Average	1	2
Real estate loan (amortizing term) [Member]
Debt instruments, interest rate, effective percentage:
Debt Weighted Average Interest Rate	5.90%
Real estate loans (revolving credit) [Member]
Debt instruments, interest rate, effective percentage:
Debt Weighted Average Interest Rate	0.00%
Working capital loans two [Member] \| U-Haul Holding Company [Member] \| SOFR
Debt instruments, interest rate, effective percentage:
Unused capacity fee	0.30%
Debt instruments, face, payment, and remaining balance amount:
Debt instrument, original face amount	$ 465,000,000
Rental Truck (amortizing loans) First Loan [Member]
Debt instruments, interest rate, effective percentage:
Debt Weighted Average Interest Rate	3.84%
Rental Truck (amortizing loans) First Loan [Member] \| U-Haul Holding Company [Member]
Debt instruments, interest rate, effective percentage:
Funding Percentage of Loans.	70.00%
Debt instruments, face, payment, and remaining balance amount:
Net book value of rental equipment		$ 213,100,000
Rental Truck (amortizing loans) First Loan [Member] \| U-Haul Holding Company [Member] \| Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	1.61%
Rental Truck (amortizing loans) First Loan [Member] \| U-Haul Holding Company [Member] \| Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	5.68%
Debt instruments, interest rate, effective percentage:
Funding Percentage of Loans.	100.00%
Finance Lease [Member]
Debt instruments, interest rate, effective percentage:
Debt Weighted Average Interest Rate	4.69%
Finance Lease [Member] \| U-Haul Holding Company [Member]
Debt instruments, face, payment, and remaining balance amount:
Net book value of rental equipment	$ 289,300,000	474,800,000
Lease Cost [Abstract]
Sale Leaseback Transaction Lease Terms	(7) year terms
Finance Lease [Member] \| U-Haul Holding Company [Member] \| Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	2.86%
Finance Lease [Member] \| U-Haul Holding Company [Member] \| Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	5.01%
Capital Lease Obligations [Member]
Debt instruments, interest rate, effective percentage:
Debt Weighted Average Interest Rate	4.10%
Capital Lease Obligations [Member] \| U-Haul Holding Company [Member]
Debt instruments, face, payment, and remaining balance amount:
Net book value of rental equipment	$ 1,989,800,000	1,499,100,000
Lease Cost [Abstract]
Sale Leaseback Transaction Lease Terms	(7) years
Capital Lease Obligations [Member] \| U-Haul Holding Company [Member] \| Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	1.60%
Capital Lease Obligations [Member] \| U-Haul Holding Company [Member] \| Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	6.80%
Private placements [Member]
Debt instruments, interest rate, effective percentage:
Debt Weighted Average Interest Rate	2.65%
Private placements [Member] \| U-Haul Holding Company [Member]
Debt instruments, face, payment, and remaining balance amount:
Aggregate borrowing capacity, amount	$ 1,200,000,000
Line of credit facility, remaining borrowing capacity		100,000,000
New capital lease obligations, amount		600,000,000
Subsidiary holdings of parent company debt		$ 150,000,000
Private placements [Member] \| U-Haul Holding Company [Member] \| Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage		2.55%
Debt instruments, issuance and maturity dates:
Debt instrument, maturity year	2029	2030
Private placements [Member] \| U-Haul Holding Company [Member] \| Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage		2.88%
Debt instruments, issuance and maturity dates:
Debt instrument, maturity year	2035	2035
Amerco Real Estate Subsidiaries and Uhaul Company of Florida [Member] \| Real estate loan (amortizing term) [Member]
Debt instruments, face, payment, and remaining balance amount:
Aggregate borrowing capacity, amount	$ 197,900,000
Amerco Real Estate Subsidiaries and Uhaul Company of Florida [Member] \| Real estate loan (amortizing term) [Member] \| SOFR
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	0.10%
Amerco Real Estate Subsidiaries and Uhaul Company of Florida [Member] \| Real estate loan (amortizing term) [Member] \| SOFR \| Minimum [Member]
Debt instruments, interest rate, effective percentage:
Applicable margin interest rate	0.65%
Amerco Real Estate Subsidiaries and Uhaul Company of Florida [Member] \| Real estate loan (amortizing term) [Member] \| SOFR \| Maximum [Member]
Debt instruments, interest rate, effective percentage:
Applicable margin interest rate	1.38%
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] \| Real estate loan (amortizing term) [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	4.30%
Debt instruments, face, payment, and remaining balance amount:
Amounts held at LIBOR plus margin	$ 79,900,000
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] \| Real estate loan (amortizing term) [Member] \| SOFR
Debt instruments, interest rate, effective percentage:
Applicable margin interest rate	5.33%
Sum of LIBOR and margin, minimum rate	6.08%
Sum of LIBOR and margin, maximum rate	6.80%
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] \| Senior mortgages [Member] \| Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	2.70%
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] \| Senior mortgages [Member] \| Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	6.05%
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] \| Rental Truck Revolvers [Member]
Debt instruments, face, payment, and remaining balance amount:
Amount held at fixed interest rate	$ 22,200,000
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] \| Rental Truck Revolvers [Member] \| SOFR
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	5.33%
Debt instruments, face, payment, and remaining balance amount:
Aggregate borrowing capacity, amount	$ 573,900,000
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] \| Private placements [Member] \| U-Haul Holding Company [Member]
Debt instruments, face, payment, and remaining balance amount:
Line of credit facility, remaining borrowing capacity	150,000,000
New capital lease obligations, amount	$ 600,000,000
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] \| Private placements [Member] \| U-Haul Holding Company [Member] \| Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	2.43%
Debt instruments, issuance and maturity dates:
Debt instrument, maturity year	2029
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] \| Private placements [Member] \| U-Haul Holding Company [Member] \| Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	2.78%
Debt instruments, issuance and maturity dates:
Debt instrument, maturity year	2033
Uhaul Intl and Subsidiaries [Member] \| Rental Truck (amortizing loans) First Loan [Member]
Debt instruments, face, payment, and remaining balance amount:
Net book value of rental equipment	$ 155,800
Uhaul Intl and Subsidiaries [Member] \| Rental Truck Revolvers [Member]
Debt instruments, face, payment, and remaining balance amount:
Net book value of rental equipment		$ 822,000,000
Uhaul Intl and Subsidiaries [Member] \| Rental Truck Revolvers [Member] \| Maximum [Member]
Debt instruments, interest rate, effective percentage:
Sum of LIBOR and margin, maximum rate	1.25%
Uhaul Intl and Subsidiaries [Member] \| Rental Truck Revolvers [Member] \| SOFR
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	2.36%
Debt instruments, face, payment, and remaining balance amount:
Aggregate borrowing capacity, amount	$ 615,000,000
Notes, loans and leases payable	$ 615,000,000
Uhaul Intl and Subsidiaries [Member] \| Rental Truck Revolvers [Member] \| U-Haul Holding Company [Member]
Debt instruments, interest rate, effective percentage:
Debt instrument at period end, LIBOR plus margin	0.10%
Uhaul S Fleet Two Thousand Ten Box Truck Note [Member] \| Other Obligations [Member] \| Maximum [Member]
Debt instruments, issuance and maturity dates:
Debt instrument, maturity year	2049
Amerco, Us Bank, National Association, Trustee [Member] \| Other Obligations [Member] \| Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	1.50%
Amerco, Us Bank, National Association, Trustee [Member] \| Other Obligations [Member] \| Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	8.00%
Life Insurance [Member] \| Uhual International, Inc [Member]
Federal Home Loan Bank, Advances, Activity for the year [Abstract]
Deposit amount			$ 60,000,000
Life Insurance [Member] \| Uhual International, Inc [Member] \| Minimum [Member]
Federal Home Loan Bank, Advances, Activity for the year [Abstract]
Deposit interest rate			0.49%
Life Insurance [Member] \| Uhual International, Inc [Member] \| Maximum [Member]
Federal Home Loan Bank, Advances, Activity for the year [Abstract]
Deposit interest rate			4.30%