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Borrowings (Narratives) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2022 | Mar. 31, 2022
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
Applicable margin, per loan agreement, maximum rate | 1.38% |  | 1.38% |  |  |
Sum of LIBOR and margin, maximum rate | 4.54% |  | 4.54% |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Notes, loans and leases payable | $ 6,200,397 |  | $ 6,200,397 |  |  | $ 6,022,497
Interest paid related to derivative contracts [Abstract] |  |  |  |  |  |
Interest paid in cash | 51,300 | $ 41,100 | $ 156,800 | $ 122,800 |  |
Real estate loan [Member] |  |  |  |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity year |  |  | 2037 |  |  |
Real estate loans (revolving credit) [Member] |  |  |  |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity year |  |  | 2027 |  |  |
Finance Lease [Member] |  |  |  |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity year |  |  | 2030 |  |  |
Finance Lease [Member] | AMERCO [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Capitalized assets, net book value | $ 504,600 |  | $ 504,600 |  |  | 620,800
Lease Cost [Abstract] |  |  |  |  |  |
Sale Leaseback Transaction Lease Terms |  |  | seven (7) year terms |  |  |
Finance Lease [Member] | AMERCO [Member] | Minimum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 2.16% |  | 2.16% |  |  |
Finance Lease [Member] | AMERCO [Member] | Maximum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 5.04% |  | 5.04% |  |  |
Capital Lease Obligations [Member] | AMERCO [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Capitalized assets, net book value | $ 1,399,500 |  | $ 1,399,500 |  |  | $ 1,068,300
Lease Cost [Abstract] |  |  |  |  |  |
Sale Leaseback Transaction Lease Terms |  |  | seven (7) years |  |  |
Capital Lease Obligations [Member] | AMERCO [Member] | Minimum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 1.60% |  | 1.60% |  |  |
Capital Lease Obligations [Member] | AMERCO [Member] | Maximum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 5.98% |  | 5.98% |  |  |
Private Placement [Member] | AMERCO [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Debt instrument, face amount | $ 600,000 |  | $ 600,000 |  |  |
Amounts held at LIBOR plus margin | $ 150,000 |  | $ 150,000 |  |  |
Private Placement [Member] | AMERCO [Member] | Minimum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 2.43% |  | 2.43% |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity year |  |  | 2029 |  |  |
Private Placement [Member] | AMERCO [Member] | Maximum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 2.78% |  | 2.78% |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity year |  |  | 2033 |  |  |
Amerco Real Estate Subsidiaries and Uhaul Company of Florida [Member] | Real estate loan [Member] |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
Applicable margin interest rate | 0.10% |  | 0.10% |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Debt instrument, face amount | $ 208,500 |  | $ 208,500 |  |  |
Line of credit facility, remaining borrowing capacity | $ 84,200 |  | $ 84,200 |  |  |
Amerco Real Estate Subsidiaries and Uhaul Company of Florida [Member] | Real estate loan [Member] | SOFR | Minimum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 3.79% |  | 3.79% |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
Applicable margin, per loan agreement, maximum rate | 0.65% |  | 0.65% |  |  |
Amerco Real Estate Subsidiaries and Uhaul Company of Florida [Member] | Real estate loan [Member] | SOFR | Maximum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 4.12% |  | 4.12% |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
Sum of LIBOR and margin, maximum rate | 5.60% |  | 5.60% |  |  |
Amerco Real Estate Subsidiaries and Uhaul Company of Florida [Member] | Real estate loan [Member] | AMERCO [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 4.29% |  | 4.29% |  |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Senior Mortgages [Member] |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
Debt Weighted Average Interest Rate | 4.09% |  | 4.09% |  |  |
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% |  | 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 | 5.50% |  | 5.50% |  |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Rental Truck Revolvers [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 0.10% |  | 0.10% |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
Debt instrument, interest rate at period end |  |  | 2.36% |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Debt instrument, face amount | $ 615,000 |  | $ 615,000 |  |  |
Line of credit, current borrowing capacity | 615,000 |  | 615,000 |  |  |
Amount held at fixed interest rates | 100,000 |  | 100,000 |  |  |
Notes, loans and leases payable | $ 615,000 |  | $ 615,000 |  |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Rental Truck Revolvers [Member] | Minimum [Member] |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
Applicable margin interest rate | 3.70% |  | 3.70% |  |  |
Applicable margin, per loan agreement, maximum rate | 1.15% |  | 1.15% |  |  |
Sum of LIBOR and margin, maximum rate | 4.95% |  | 4.95% |  |  |
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] | Rental Truck Revolvers [Member] | Maximum [Member] |  |  |  |  |  |
Debt instruments, interest rate, effective percentage: |  |  |  |  |  |
Applicable margin interest rate | 4.12% |  | 4.12% |  |  |
Applicable margin, per loan agreement, maximum rate | 1.25% |  | 1.25% |  |  |
Sum of LIBOR and margin, maximum rate | 5.44% |  | 5.44% |  |  |
Uhaul Intl and Subsidiaries [Member] | Working capital loans two [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 |  | $ 465,000 |  |  |
Line of credit facility, maximum borrowing capacity | 465,000 |  | 465,000 |  |  |
Line of credit, current borrowing capacity | $ 150,000 |  | $ 150,000 |  |  |
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) First Loan [Member] | Minimum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 1.61% |  | 1.61% |  |  |
Uhaul Intl and Subsidiaries [Member] | Rental Truck (amortizing loans) First Loan [Member] | Maximum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 5.68% |  | 5.68% |  |  |
Uhaul Intl and Subsidiaries [Member] | Private Placement [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Amount held at fixed interest rates | $ 150,000 |  | $ 150,000 |  |  |
New capital lease obligiations, amount |  |  | 100,000 |  |  |
Line of credit facility increase, amount |  |  | $ 600,000 |  |  |
Uhaul Intl and Subsidiaries [Member] | Private Placement [Member] | Minimum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 2.55% |  | 2.55% |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity year |  |  | 2030 |  |  |
Uhaul Intl and Subsidiaries [Member] | Private Placement [Member] | Maximum [Member] |  |  |  |  |  |
Debt instruments, interest rate, stated percentage: |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 2.88% |  | 2.88% |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity year |  |  | 2035 |  |  |
Amerco, Us Bank, National Association, Trustee [Member] | Other Obligations [Member] |  |  |  |  |  |
Debt instruments, face, payment, and remaining balance amount: |  |  |  |  |  |
Line of credit facility, remaining borrowing capacity | $ 79,200 |  | $ 79,200 |  |  |
Subsidiary holdings of parent company debt | $ 1,800 |  | $ 1,800 |  |  |
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% |  | 1.50% |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity year |  |  | 2023 |  |  |
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% |  | 8.00% |  |  |
Debt instruments, issuance and maturity dates: |  |  |  |  |  |
Debt instrument, maturity year |  |  | 2049 |  |  |
Life Insurance [Member] | Federal Home Loan Bank [Member] |  |  |  |  |  |
Federal Home Loan Bank, Advances, Activity for the year [Abstract] |  |  |  |  |  |
Aggregate deposit amount |  |  |  |  | $ 60,000 |
Available for sale equity securities, noncurrent |  |  |  |  | 88,900 |
Available for sale equity securities pledged as collateral |  |  |  |  | $ 62,800 |
Life Insurance [Member] | Federal Home Loan Bank [Member] | Minimum [Member] |  |  |  |  |  |
Federal Home Loan Bank, Advances, Activity for the year [Abstract] |  |  |  |  |  |
Deposit interest rate |  |  |  |  | 0.69% |
Life Insurance [Member] | Federal Home Loan Bank [Member] | Maximum [Member] |  |  |  |  |  |
Federal Home Loan Bank, Advances, Activity for the year [Abstract] |  |  |  |  |  |
Deposit interest rate |  |  |  |  | 4.21% |

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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 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 Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123466204&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 45 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=120413173&loc=SL6242262-115580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI https://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=127002003&loc=SL6242269-115581 + Details
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- Definition Amount of advances from the Federal Home Loan Bank (FHLB). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126999549&loc=d3e4297-108586 + Details
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