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v3.25.1

Notes, Loans and Finance Leases Payable, net (Narratives) (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2024 | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | Aug. 21, 2024
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Debt Instrument Carrying Amount |  |  |  |  | $ 6,703,510 | $ 5,850,346 |
Notes, loans and leases payable |  |  |  |  | $ 7,193,857 | $ 6,271,362 |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |  |
Remaining Lease Term Finance Lease Weighted Average |  |  |  |  | 0.6 | 1 |
Debt instruments, miscellaneous information: |  |  |  |  |  |  |
Debt Instrument, Frequency of Periodic Payment | Interest is payable semiannually |  |  |  |  |  |
Real estate loan (amortizing term) [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |  |
Debt Weighted Average Interest Rate |  |  |  |  | 5.18% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Debt Instrument Carrying Amount |  |  |  |  | $ 265,887 | $ 277,767 |
Working capital loans two [Member] | U-Haul Holding Company [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |  |
Unused capacity fee |  |  |  |  | 0.25% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Aggregate borrowing capacity, amount |  |  |  |  | $ 465,000 |  |
Rental Truck (amortizing loans) First Loan [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |  |
Debt Weighted Average Interest Rate |  |  |  |  | 5.29% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Debt Instrument Carrying Amount |  |  |  |  | $ 125,839 | 70,454 |
Rental Truck (amortizing loans) First Loan [Member] | U-Haul Holding Company [Member] |  |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Capitalized assets, net book value |  |  |  |  | $ 234,700 | 155,800 |
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% |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |  |
Funding Percentage of Loans. |  |  |  |  | 70.00% |  |
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 |  |  |  |  | 6.02% |  |
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 |  |  |  |  | 5.09% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Debt Instrument Carrying Amount |  |  |  |  | $ 1,963,644 | 1,708,619 |
Finance Lease [Member] | U-Haul Holding Company [Member] |  |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Net book value of rental equipment |  |  |  |  | $ 138,700 | 300 |
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 |  |  |  |  | 2.89% |  |
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 |  |  |  |  | 4.39% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Debt Instrument Carrying Amount |  |  |  |  | $ 44,338 | 117,641 |
Capital Lease Obligations [Member] | U-Haul Holding Company [Member] |  |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Net book value of rental equipment |  |  |  |  | $ 2,420,700 | 1,989,800 |
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 |  |  |  |  | 3.62% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Debt Instrument Carrying Amount |  |  |  |  | $ 1,700,000 | 1,200,000 |
Private placements [Member] | U-Haul Holding Company [Member] |  |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Debt instrument, original face amount |  | $ 600,000 | $ 600,000 |  |  |  |
Debt Instrument Carrying Amount |  |  |  |  |  |  | $ 500,000
Amount held at fixed interest rate |  |  | $ 150,000 |  |  |  |
Debt instruments, miscellaneous information: |  |  |  |  |  |  |
Debt Instrument, Frequency of Periodic Payment |  | Interest is payable semiannually | Interest is payable semiannually |  |  |  |
Private placements [Member] | U-Haul Holding Company [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  | 2.55% | 2.43% |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Amount held at fixed interest rate |  | $ 100,000 |  |  |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |  |
Debt instrument, maturity year |  | 2030 | 2029 |  |  |  |
Private placements [Member] | U-Haul Holding Company [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  | 2.88% | 2.78% |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Amount held at fixed interest rate |  | $ 150,000 |  |  |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |  |
Debt instrument, maturity year |  | 2035 | 2033 |  |  |  |
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, interest rate, effective percentage: |  |  |  |  |  |  |
Variable interest rate on debt |  |  |  |  | 4.32% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Aggregate borrowing capacity, amount |  |  |  |  | $ 189,400 |  |
Amount held at fixed interest rate |  |  |  |  | $ 76,500 |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Real estate loan (amortizing term) [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |  |
Applicable margin interest rate |  |  |  |  | 0.65% |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Real estate loan (amortizing term) [Member] | 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] | Credit Spread Option [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |  |
Interest rate, subject to change during period |  |  |  |  | 0.10% |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Real estate loan (amortizing term) [Member] | Credit Spread Option [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |  |
Applicable Margins, Low Rate |  |  |  |  | 5.07% |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Real estate loan (amortizing term) [Member] | Credit Spread Option [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |  |
Applicable Margins, High Rate |  |  |  |  | 5.80% |  |
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, interest rate, effective percentage: |  |  |  |  |  |  |
Applicable margin, per loan agreement, minimum rate |  |  |  |  | 0.10% |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Aggregate borrowing capacity, amount |  |  |  |  | $ 635,000 |  |
Debt instrument, original face amount |  |  |  |  | 625,000 |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | 625,000 |  |
Amount held at fixed interest rate |  |  |  |  | 187,500 |  |
Net book value of rental equipment |  |  |  |  | $ 918,200 | $ 756,500 |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Rental Truck Revolvers [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |  |
Interest rate, subject to change during period |  |  |  |  | 4.32% |  |
Applicable margin interest rate |  |  |  |  | 0.75% |  |
Applicable margin, per loan agreement, maximum rate |  |  |  |  | 4.36% |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Rental Truck Revolvers [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |  |
Interest rate, subject to change during period |  |  |  |  | 4.35% |  |
Applicable margin interest rate |  |  |  |  | 1.25% |  |
Applicable margin, per loan agreement, maximum rate |  |  |  |  | 4.71% |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Rental Truck Revolvers [Member] | Credit Spread Option [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |  |
Variable interest rate on debt |  |  |  |  | 5.17% |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Rental Truck Revolvers [Member] | Credit Spread Option [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |  |
Variable interest rate on debt |  |  |  |  | 5.67% |  |
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] | U-Haul Holding Company [Member] |  |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Aggregate borrowing capacity, amount |  |  |  |  | $ 68,400 |  |
Subsidiary holdings of parent company debt |  |  |  |  | 1,500 |  |
Amerco, Us Bank, National Association, Trustee [Member] | Other Obligations [Member] | U-Haul Holding Company [Member] |  |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Subsidiary holdings of parent company debt |  |  |  |  | $ 20,500 |  |
Amerco, Us Bank, National Association, Trustee [Member] | Other Obligations [Member] | U-Haul Holding Company [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  | 1.50% |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |  |
Debt instrument, maturity year |  |  |  |  | 2025 |  |
Amerco, Us Bank, National Association, Trustee [Member] | Other Obligations [Member] | U-Haul Holding Company [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  | 8.00% |  |
Life Insurance [Member] | FHLB [Member] |  |  |  |  |  |  |
Federal Home Loan Bank, Advances, Activity for the year [Abstract] |  |  |  |  |  |  |
Deposit amount |  |  |  | $ 85,000 |  |  |
Deposit earliest maturity date |  |  |  | Mar. 31, 2025 |  |  |
Deposit latest maturity date |  |  |  | Apr. 02, 2029 |  |  |
Available for sale equity securities, noncurrent |  |  |  | $ 213,400 |  |  |
Available for sale equity securities pledged as collateral |  |  |  | $ 187,000 |  |  |
Life Insurance [Member] | FHLB [Member] | Minimum [Member] |  |  |  |  |  |  |
Federal Home Loan Bank, Advances, Activity for the year [Abstract] |  |  |  |  |  |  |
Deposit interest rate |  |  |  | 0.55% |  |  |
Life Insurance [Member] | FHLB [Member] | Maximum [Member] |  |  |  |  |  |  |
Federal Home Loan Bank, Advances, Activity for the year [Abstract] |  |  |  |  |  |  |
Deposit interest rate |  |  |  | 4.52% |  |  |
Debt Instrument, Redemption, Period One [Member] | Private placements [Member] | U-Haul Holding Company [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 5.86%
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Borrowings under Guaranteed Investment Agreements |  |  |  |  |  |  | $ 100,000
Debt instruments, issuance and maturity dates: |  |  |  |  |  |  |
Debt instrument, maturity date | Aug. 21, 2032 |  |  |  |  |  |
Debt Instrument, Redemption, Period Two [Member] | Private placements [Member] | U-Haul Holding Company [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 5.91%
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Borrowings under Guaranteed Investment Agreements |  |  |  |  |  |  | $ 100,000
Debt instruments, issuance and maturity dates: |  |  |  |  |  |  |
Debt instrument, maturity date | Aug. 21, 2033 |  |  |  |  |  |
Debt Instrument, Redemption, Period Three [Member] | Private placements [Member] | U-Haul Holding Company [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 5.95%
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Borrowings under Guaranteed Investment Agreements |  |  |  |  |  |  | $ 100,000
Debt instruments, issuance and maturity dates: |  |  |  |  |  |  |
Debt instrument, maturity date | Aug. 21, 2034 |  |  |  |  |  |
Debt Instrument, Redemption, Period Four [Member] | Private placements [Member] | U-Haul Holding Company [Member] |  |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 6.00%
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |  |
Borrowings under Guaranteed Investment Agreements |  |  |  |  |  |  | $ 200,000
Debt instruments, issuance and maturity dates: |  |  |  |  |  |  |
Debt instrument, maturity date | Aug. 21, 2035 |  |  |  |  |  |
Debt Instrument, Redemption, Period Four [Member] | Private placements [Member] | U-Haul Holding Company [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |  |
Debt instrument, maturity year | 2032 |  |  |  |  |  |
Debt Instrument, Redemption, Period Four [Member] | Private placements [Member] | U-Haul Holding Company [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |  |
Debt instrument, maturity year | 2035 |  |  |  |  |  |

X
- Definition Fleet loan provision specified LIBOR plus applicable margin. This is the highest of the two applicable margin rates at the time of the loan agreement. + References No definition available. + Details
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- Definition Fleet loan provision specified LIBOR plus applicable margin. This is the lower of the two applicable margin rates at the time of the loan agreement. + References No definition available. + Details
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- Definition Sum of LIBOR and margin, at the higher of the rate. + References No definition available. + Details
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- 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
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- Definition Federal Home Loan Bank Advances Branch Of Fhlb Bank Maturity Date + References No definition available. + Details
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- Definition Federal Home Loan Bank Advances Branch Of Fhlb Bank Maturity Date Two + References No definition available. + Details
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- Definition Funding percentage of loans. + References No definition available. + Details
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- 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
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- Definition The amount of corporate (parent company) debt held by our insurance subsidiaries. + References No definition available. + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481830/320-10-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(12)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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- Definition Carrying value as of the balance sheet date of the sum of the obligations to contract holders to provide to them an agreed upon rate of return pursuant to the terms of the underlying contract. These contracts represent lending by the contract holders to the entity in return for a guaranteed (primarily fixed) interest rate until maturity, unless called earlier if the contracts provide that option to the contract holders (usually institutions). There is little or no insurance risk for the entity. + 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)(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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