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Schedule V, AMERCO and Consolidated Subsidiaries, Supplemental Information (for Property-Casualty Insurance Operations) (Details) (Consolidated property casualty entity [Member], AMERCO [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Consolidated property casualty entity [Member] | AMERCO [Member] |  |  |
Supplemental information for property, casualty insurance underwriters: |  |  |
Deferred policy acquisition costs |  |  |
Reserves for unpaid claims and claims adjustment expense | 271,609 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersReservesForUnpaidClaimsAndClaimsAdjustmentExpense / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember | 295,126 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersReservesForUnpaidClaimsAndClaimsAdjustmentExpense / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember | 330,093 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersReservesForUnpaidClaimsAndClaimsAdjustmentExpense / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
Discount if any, deducted |  |  |
Unearned premiums |  |  |
Net earned premiums (1) | 46,456 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersEarnedPremiums / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember | 41,052 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersEarnedPremiums / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember | 34,342 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersEarnedPremiums / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
Net investment income (2) | 11,980 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersNetInvestmentIncome / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember | 10,057 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersNetInvestmentIncome / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember | 8,976 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersNetInvestmentIncome / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
Claim and claim adjustment expenses incurred related to current year | 11,690 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember | 9,861 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember | 8,962 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
Claim and claim adjustment expenses incurred related to prior year | (694)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember | 1,652 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember | 7,036 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
Amortization of deferred policy acquisition costs |  |  |
Paid claims and claim adjustment expense | 18,872 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPaidClaimsAndClaimsAdjustmentExpense / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember | 6,576 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPaidClaimsAndClaimsAdjustmentExpense / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember | 20,807 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPaidClaimsAndClaimsAdjustmentExpense / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
Net premiums written (1) | $ 46,452 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPremiumsWritten / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember | $ 41,065 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPremiumsWritten / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember | $ 34,378 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPremiumsWritten / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember

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- Definition Amount of amortization expense on deferred policy acquisition cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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- Definition Amount of expense for claims incurred in the current reporting period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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- Definition Amount of deferred policy acquisition cost related to property-casualty insurance policy written. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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- Definition The amount of discount that may be deducted from the reserve for unpaid claims and claims adjustment expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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- Definition Amount of property-casualty insurance premium revenue earned on insurance policies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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- Definition Amount of net investment income earned by property-casualty insurance underwriter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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- Definition Payments of claims and claims adjustment expenses during the period of a property-casualty insurance entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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- Definition Amount of actual premium written by property-casualty insurance underwriter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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- Definition Amount of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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- Definition The amount of reserve, policy claim payable and loss expense incurred by property-casualty insurance underwriter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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- Definition Amount of property-casualty insurance premium revenue not yet earned on insurance policies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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