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Notes, Loans and Finance Leases Payable, net (Narratives) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2024
Long-Term Debt, Unclassified [Abstract] |  |  |  |  |
Notes, loans and leases payable, gross | $ 6,444,590 |  | $ 6,444,590 |  | $ 5,850,346
Interest Paid, Including Capitalized Interest, Operating and Investing Activities [Abstract] |  |  |  |  |
Interest paid in cash | 65,000 | $ 800 | 207,200 | $ 191,400 |
Interest paid (received) in cash on derivative contracts | 1,200 | $ 1,500 | 4,200 | $ 3,800 |
Private Placement |  |  |  |  |
Long-Term Debt, Unclassified [Abstract] |  |  |  |  |
Notes, loans and leases payable, gross | 1,700,000 |  | $ 1,700,000 |  | $ 1,200,000
Private Placement | U-Haul Holding Company |  |  |  |  |
Long-Term Debt, Unclassified [Abstract] |  |  |  |  |
Debt Issuance Date |  |  | Aug. 21, 2024 |  |
Notes, loans and leases payable, gross | 500,000 |  | $ 500,000 |  |
Debt Instrument, Frequency of Periodic Payment |  |  | Interest is payable semiannually |  |
Private Placement | U-Haul Holding Company | Series A, amount |  |  |  |  |
Long-Term Debt, Unclassified [Abstract] |  |  |  |  |
Borrowings under Guaranteed Investment Agreements | $ 100,000 |  | $ 100,000 |  |
Debt instrument, interest rate, stated percentage | 5.86% |  | 5.86% |  |
Senior note, maturity date |  |  | Aug. 21, 2032 |  |
Private Placement | U-Haul Holding Company | Series B, amount |  |  |  |  |
Long-Term Debt, Unclassified [Abstract] |  |  |  |  |
Borrowings under Guaranteed Investment Agreements | $ 100,000 |  | $ 100,000 |  |
Debt instrument, interest rate, stated percentage | 5.91% |  | 5.91% |  |
Senior note, maturity date |  |  | Aug. 21, 2033 |  |
Private Placement | U-Haul Holding Company | Series C, amount |  |  |  |  |
Long-Term Debt, Unclassified [Abstract] |  |  |  |  |
Borrowings under Guaranteed Investment Agreements | $ 100,000 |  | $ 100,000 |  |
Debt instrument, interest rate, stated percentage | 5.95% |  | 5.95% |  |
Senior note, maturity date |  |  | Aug. 21, 2034 |  |
Private Placement | U-Haul Holding Company | Series D, amount |  |  |  |  |
Long-Term Debt, Unclassified [Abstract] |  |  |  |  |
Borrowings under Guaranteed Investment Agreements | $ 200,000 |  | $ 200,000 |  |
Debt instrument, interest rate, stated percentage | 6.00% |  | 6.00% |  |
Senior note, maturity date |  |  | Aug. 21, 2035 |  |
Private Placement | U-Haul Holding Company | Minimum [Member] |  |  |  |  |
Long-Term Debt, Unclassified [Abstract] |  |  |  |  |
Maturity Year |  |  | 2032 |  |
Private Placement | U-Haul Holding Company | Maximum [Member] |  |  |  |  |
Long-Term Debt, Unclassified [Abstract] |  |  |  |  |
Maturity Year |  |  | 2035 |  |

X
- 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 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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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: 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(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
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- Definition Description of the frequency of periodic payments (monthly, quarterly, annual). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477734/942-470-50-3 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -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 Reference 2: 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 + Details
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- Definition Date the debt instrument was issued, in YYYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B + 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 -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-2 + Details
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- Definition The net cash outflow or inflow from derivative instruments during the period, which are classified as financing activities, excluding those designated as hedging instruments. + References No definition available. + Details
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