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Related Party Costs and Expenses (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Related Party Cost and Expense [Abstract] |  |  |
Related party expenses, total | $ 54,709 us-gaap_CostsAndExpensesRelatedParty | $ 52,552 us-gaap_CostsAndExpensesRelatedParty | $ 46,461 us-gaap_CostsAndExpensesRelatedParty
Sac Holdings [Member] |  |  |
Related Party Cost and Expense [Abstract] |  |  |
U-Haul lease expenses | 2,618 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMember | 2,619 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMember | 2,626 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMember
U-Haul commission expenses | 48,833 us-gaap_OtherGeneralAndAdministrativeExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMember | 46,886 us-gaap_OtherGeneralAndAdministrativeExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMember | 41,185 us-gaap_OtherGeneralAndAdministrativeExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMember
Private Mini [Member] |  |  |
Related Party Cost and Expense [Abstract] |  |  |
U-Haul commission expenses | $ 3,258 us-gaap_OtherGeneralAndAdministrativeExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_PrivateMiniMember | $ 3,047 us-gaap_OtherGeneralAndAdministrativeExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_PrivateMiniMember | $ 2,650 us-gaap_OtherGeneralAndAdministrativeExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_PrivateMiniMember

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- Definition Costs of sales and operating expenses for the period incurred from transactions with related parties. + 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 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The sum of expenses not otherwise specified in the taxonomy for managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + 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 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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