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ESOP Total Amount Contributed to the Plan Trust (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Employee stock ownership plan (ESOP), cash contributions to ESOP | $ 1.0 us-gaap_EmployeeStockOwnershipPlanESOPCashContributionsToESOP | $ 0.7 us-gaap_EmployeeStockOwnershipPlanESOPCashContributionsToESOP | $ 1.7 us-gaap_EmployeeStockOwnershipPlanESOPCashContributionsToESOP
Unallocated common stock dividend, debt repayment | 0.6 us-gaap_EmployeeStockOwnershipPlanESOPDebtStructureDirectLoanEmployerCashPaymentsUsedForDebtService |  |
Cash contributions to ESOP, non leveraged | $ 8.0 uhal_EmployeeStockOwnershipPlanESOPCashContributionsToESOPNonLeveraged |  |

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- Definition This item represents the non leveraged amount of cash contributions during the period made by the entity to the Employee Stock Ownership Plan (ESOP). + References No definition available. + Details
Name: | uhal_EmployeeStockOwnershipPlanESOPCashContributionsToESOPNonLeveraged
Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This item represents the amount of cash contributions during the period made by the entity to the Employee Stock Ownership Plan (ESOP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPCashContributionsToESOP
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of cash provided by the employer through contributions or dividends that the ESOP used in the period to repay debt and interest on a third-party loan made directly to the ESOP. + 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) -URI http://asc.fasb.org/extlink&oid=6418455&loc=d3e16545-113920 + Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPDebtStructureDirectLoanEmployerCashPaymentsUsedForDebtService
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration