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Schedule V - U-Haul Holding Company and Consolidated Subsidiaries, Supplemental Information (for Property-Casualty Insurance Operations) (Details) - Property Casualty Insurance Operations [Member] - U-Haul Holding Company [Member] - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Supplemental Information For Property And Casualty Insurance Underwriters [Abstract] |  |  |
Reserves for unpaid claims and claims adjustment expense | $ 125,605 | $ 131,192 | $ 151,874
Unearned premiums | 50 | 158 | 97
Net earned premiums (1) | 101,953 | 97,927 | 96,242
Net investment income (2) | 19,361 | 25,158 | 7,314
Claim and claim adjustment expenses incurred related to current year | 30,293 | 25,396 | 27,570
Prior years | (7,663) | (13,153) | (5,828)
Paid claims and claim adjustment expense | 24,398 | 27,783 | 22,965
Net premiums written (1) | $ 101,903 | $ 98,085 | $ 96,145

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- Definition Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 + Details
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- Definition Amount of loss reported and paid for claim and claim adjustment expense by property-casualty insurance underwriter. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column J)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477965/944-235-S99-3 + Details
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