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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
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 271,609us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersReservesForUnpaidClaimsAndClaimsAdjustmentExpense
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
/ us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis
= us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
295,126us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersReservesForUnpaidClaimsAndClaimsAdjustmentExpense
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
/ us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis
= us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
330,093us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersReservesForUnpaidClaimsAndClaimsAdjustmentExpense
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
/ us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis
= us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
Discount if any, deducted         
Unearned premiums         
Net earned premiums (1) 46,456us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersEarnedPremiums
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
/ us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis
= us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
41,052us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersEarnedPremiums
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
/ us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis
= us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
34,342us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersEarnedPremiums
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
/ us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis
= us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
Net investment income (2) 11,980us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersNetInvestmentIncome
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
/ us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis
= us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
10,057us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersNetInvestmentIncome
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
/ us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis
= us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
8,976us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersNetInvestmentIncome
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
/ us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis
= us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
Claim and claim adjustment expenses incurred related to current year 11,690us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
/ us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis
= us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
9,861us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
/ us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis
= us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
8,962us-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
1,652us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
/ us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis
= us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
7,036us-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 18,872us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPaidClaimsAndClaimsAdjustmentExpense
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
/ us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis
= us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
6,576us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPaidClaimsAndClaimsAdjustmentExpense
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
/ us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis
= us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
20,807us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPaidClaimsAndClaimsAdjustmentExpense
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
/ us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis
= us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
Net premiums written (1) $ 46,452us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPremiumsWritten
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
/ us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis
= us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
$ 41,065us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPremiumsWritten
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
/ us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis
= us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
$ 34,378us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPremiumsWritten
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
/ us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis
= us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember