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Related Party Transactions (Narratives) (Details) - USD ($) | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Sac Holdings [Member] |  |  |
Related party notes receivable: |  |  |
Cash interest payments | $ 400,000 |  |
Related party costs and expenses: |  |  |
Interest paid (received) in cash on derivative contracts | 400,000 |  |
Sac Holdings, Four Sac, Five Sac, Galaxy, Privite mini [Member] |  |  |
Related party costs and expenses: |  |  |
Revenue, excluding dealer agreement commissions and expenses | 29,700,000 | $ 29,800,000 | $ 28,500,000
Expenses, related parties | 2,400,000 | 2,400,000 | 2,400,000
Cash flow, related party | 27,300,000 | 27,400,000 | 25,900,000
Revenue, generated by the dealer agreement from related parties | 384,500,000 | 418,900,000 | 417,900,000
Commission expenses, generated from dealer agreement with related parties | 82,100,000 | 88,100,000 | 88,300,000
Various Subsidiaries of Amerco [Member] |  |  |
Related party notes receivable: |  |  |
One time cash interest proceeds | 2,900,000 |  |
Amerco, Uhaul Intl [Member] |  |  |
Related party notes receivable: |  |  |
One time cash interest proceeds | 8,900 |  |
Notes receivable, related party | $ 37,200,000 | $ 37,000,000 | $ 38,500,000
Amerco, Uhaul Intl [Member] | Minimum [Member] |  |  |
Property Management Fee [Abstract] |  |  |
Management fee rate | 4.00% |  |
Amerco, Uhaul Intl [Member] | Maximum [Member] |  |  |
Property Management Fee [Abstract] |  |  |
Management fee rate | 10.00% |  |

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- Definition Cash generated from agreements and notes with SAC Holdings, Four SAC, Five SAC, Galaxy and Private Mini, excluding Dealer Agreements. + References No definition available. + Details
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- Definition These agreements and notes with subsidiaries of SAC Holdings, 4 SAC, 5 SAC, Galaxy and Private Mini, Excluded Dealer Agreements commission expenses. + References No definition available. + Details
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- Definition Amount of revenue earned from products and services provided under the terms of contract, including, but not limited to, government contracts and construction contracts, classified as other. + References No definition available. + Details
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- Definition One time interest payment received on loans and other debt instruments. + References No definition available. + Details
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- Definition The amount of revenue received excluding any revenue generated from dealer commissions or expenses as part of the dealer contract between the Company and these related party entities. + References No definition available. + Details
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- Definition This provides just the cost and expense for SAC holdings. + References No definition available. + Details
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- Definition Interest received on loans and other debt instruments during the current period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 16 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-16 + Details
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- References No definition available. + Details
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- Definition Financial instruments issued by insurance entities (surplus notes) that are includable in surplus for statutory accounting purposes as prescribed or permitted by state laws and regulations that are liabilities of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 470 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479242/944-470-45-1 + Details
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- Details
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