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Industry Segment and Geographic Area Data (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Fiscal year ended: |  |  |
Total revenues | $ 3,074,531 us-gaap_Revenues | $ 2,835,252 us-gaap_Revenues | $ 2,558,587 us-gaap_Revenues
Depreciation and amortization, net of (gains) losses on disposals | 297,826 uhal_DepreciationAndAmortizationNetOfGainsLossesOnDisposals | 279,594 uhal_DepreciationAndAmortizationNetOfGainsLossesOnDisposals | 255,372 uhal_DepreciationAndAmortizationNetOfGainsLossesOnDisposals
Interest expense | 97,525 us-gaap_InterestExpense | 92,692 us-gaap_InterestExpense | 90,696 us-gaap_InterestExpense
Pretax earnings | 561,418 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 537,522 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 408,487 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense | 204,677 us-gaap_IncomeTaxExpenseBenefit | 195,131 us-gaap_IncomeTaxExpenseBenefit | 143,779 us-gaap_IncomeTaxExpenseBenefit
Identifiable assets | 6,872,175 us-gaap_Assets | 5,998,978 us-gaap_Assets | 5,306,601 us-gaap_Assets
United States [Member] |  |  |
Fiscal year ended: |  |  |
Total revenues | 2,916,027 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 2,681,800 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 2,409,291 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US
Depreciation and amortization, net of (gains) losses on disposals | 292,345 uhal_DepreciationAndAmortizationNetOfGainsLossesOnDisposals / us-gaap_StatementGeographicalAxis = country_US | 272,236 uhal_DepreciationAndAmortizationNetOfGainsLossesOnDisposals / us-gaap_StatementGeographicalAxis = country_US | 247,413 uhal_DepreciationAndAmortizationNetOfGainsLossesOnDisposals / us-gaap_StatementGeographicalAxis = country_US
Interest expense | 96,979 us-gaap_InterestExpense / us-gaap_StatementGeographicalAxis = country_US | 92,128 us-gaap_InterestExpense / us-gaap_StatementGeographicalAxis = country_US | 90,137 us-gaap_InterestExpense / us-gaap_StatementGeographicalAxis = country_US
Pretax earnings | 541,371 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementGeographicalAxis = country_US | 516,207 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementGeographicalAxis = country_US | 389,342 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementGeographicalAxis = country_US
Income tax expense | 199,444 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_US | 189,419 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_US | 138,911 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_US
Identifiable assets | 6,685,572 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US | 5,854,503 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US | 5,160,889 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US
Canada [Member] |  |  |
Fiscal year ended: |  |  |
Total revenues | 158,504 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CA | 153,452 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CA | 149,296 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CA
Depreciation and amortization, net of (gains) losses on disposals | 5,481 uhal_DepreciationAndAmortizationNetOfGainsLossesOnDisposals / us-gaap_StatementGeographicalAxis = country_CA | 7,358 uhal_DepreciationAndAmortizationNetOfGainsLossesOnDisposals / us-gaap_StatementGeographicalAxis = country_CA | 7,959 uhal_DepreciationAndAmortizationNetOfGainsLossesOnDisposals / us-gaap_StatementGeographicalAxis = country_CA
Interest expense | 546 us-gaap_InterestExpense / us-gaap_StatementGeographicalAxis = country_CA | 564 us-gaap_InterestExpense / us-gaap_StatementGeographicalAxis = country_CA | 559 us-gaap_InterestExpense / us-gaap_StatementGeographicalAxis = country_CA
Pretax earnings | 20,047 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementGeographicalAxis = country_CA | 21,315 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementGeographicalAxis = country_CA | 19,145 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementGeographicalAxis = country_CA
Income tax expense | 5,233 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_CA | 5,712 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_CA | 4,868 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementGeographicalAxis = country_CA
Identifiable assets | $ 186,603 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_CA | $ 144,475 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_CA | $ 145,712 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_CA

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- Definition This company-specific concept is a combination of three us-gaap taxonomy concepts. (1) Depreciation: "The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation." (2) Gain (Loss) on Disposition of Assets: "The gains and losses included in earnings resulting from the sale or disposal of tangible assets." (3) Deferred Policy Acquisition Cost Amortization Expense: "Amount of deferred policy acquisition costs charged to expense in the period, generally in proportion to related revenue earned, estimated gross profits, or over the customer relationship or some other period." + References No definition available. + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 + Details
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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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