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Summary of Financing Arrangements for Leveraged ESOP Debt (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Issued June, 1991 [Member] |  |  |
Debt Disclosure [Abstract] |  |  |
Employee stock ownership plan (ESOP), debt structure, indirect loan, amount | $ 240 us-gaap_EmployeeStockOwnershipPlanESOPDebtStructureIndirectLoanAmount / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = uhal_FirstLoanMember |  |
Employee stock ownership plan (ESOP), interest payments | 48 us-gaap_EmployeeStockOwnershipPlanESOPInterestPaymentsFromESOP / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = uhal_FirstLoanMember | 53 us-gaap_EmployeeStockOwnershipPlanESOPInterestPaymentsFromESOP / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = uhal_FirstLoanMember | 250 us-gaap_EmployeeStockOwnershipPlanESOPInterestPaymentsFromESOP / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = uhal_FirstLoanMember
Issued March, 1999 [Member] |  |  |
Debt Disclosure [Abstract] |  |  |
Employee stock ownership plan (ESOP), debt structure, indirect loan, amount |  |  |
Employee stock ownership plan (ESOP), interest payments |  |  |
Issued February, 2000 [Member] |  |  |
Debt Disclosure [Abstract] |  |  |
Employee stock ownership plan (ESOP), debt structure, indirect loan, amount |  |  |
Employee stock ownership plan (ESOP), interest payments |  |  |
Issued April, 2001 [Member] |  |  |
Debt Disclosure [Abstract] |  |  |
Employee stock ownership plan (ESOP), debt structure, indirect loan, amount |  |  |
Employee stock ownership plan (ESOP), interest payments |  |  |
Issued July, 2009 [Member] |  |  |
Debt Disclosure [Abstract] |  |  |
Employee stock ownership plan (ESOP), debt structure, indirect loan, amount | 866 us-gaap_EmployeeStockOwnershipPlanESOPDebtStructureIndirectLoanAmount / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = uhal_FifthLoanMember |  |
Employee stock ownership plan (ESOP), interest payments | $ 31 us-gaap_EmployeeStockOwnershipPlanESOPInterestPaymentsFromESOP / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = uhal_FifthLoanMember | $ 17 us-gaap_EmployeeStockOwnershipPlanESOPInterestPaymentsFromESOP / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = uhal_FifthLoanMember | $ 35 us-gaap_EmployeeStockOwnershipPlanESOPInterestPaymentsFromESOP / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = uhal_FifthLoanMember

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- Definition The amount reported as a liability as of the balance sheet date by the entity (the employer) of the loan made by a third-party lender to the employer relating to loans made by the employer to the ESOP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Indirect Loan -URI http://asc.fasb.org/extlink&oid=6515647 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6418455&loc=d3e16545-113920 + Details
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- Definition An entity often discloses the amount of interest paid by the ESOP to a lender. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6418455&loc=d3e16545-113920 + Details
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