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Related Party Notes Receivable and Management Fees [Text] (Details) (USD $)
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Sac Holdings [Member]      
Related party notes receivable:      
Notes receivable outstanding $ 50,428,000us-gaap_NotesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMember
$ 71,464,000us-gaap_NotesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMember
 
Operating Segments [Member] | Moving and Storage Operating Segment [Member] | AMERCO [Member] | Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member]      
Management fees revenue:      
Management fees received exclusive of reimbursed expenses 25,800,000us-gaap_ManagementFeesBaseRevenue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMercuryFourSacFiveSacGalaxyAndPrivateMiniMember
/ us-gaap_StatementBusinessSegmentsAxis
= uhal_MovingAndStorageConsolidationsMember
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
25,800,000us-gaap_ManagementFeesBaseRevenue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMercuryFourSacFiveSacGalaxyAndPrivateMiniMember
/ us-gaap_StatementBusinessSegmentsAxis
= uhal_MovingAndStorageConsolidationsMember
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
23,700,000us-gaap_ManagementFeesBaseRevenue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMercuryFourSacFiveSacGalaxyAndPrivateMiniMember
/ us-gaap_StatementBusinessSegmentsAxis
= uhal_MovingAndStorageConsolidationsMember
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
Management fee rate, lowest 4.00%uhal_RelatedPartyTransactionRateLowest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMercuryFourSacFiveSacGalaxyAndPrivateMiniMember
/ us-gaap_StatementBusinessSegmentsAxis
= uhal_MovingAndStorageConsolidationsMember
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
4.00%uhal_RelatedPartyTransactionRateLowest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMercuryFourSacFiveSacGalaxyAndPrivateMiniMember
/ us-gaap_StatementBusinessSegmentsAxis
= uhal_MovingAndStorageConsolidationsMember
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
4.00%uhal_RelatedPartyTransactionRateLowest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMercuryFourSacFiveSacGalaxyAndPrivateMiniMember
/ us-gaap_StatementBusinessSegmentsAxis
= uhal_MovingAndStorageConsolidationsMember
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
Management fee rate, highest 10.00%uhal_ManagementFeesRateHighest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMercuryFourSacFiveSacGalaxyAndPrivateMiniMember
/ us-gaap_StatementBusinessSegmentsAxis
= uhal_MovingAndStorageConsolidationsMember
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
10.00%uhal_ManagementFeesRateHighest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMercuryFourSacFiveSacGalaxyAndPrivateMiniMember
/ us-gaap_StatementBusinessSegmentsAxis
= uhal_MovingAndStorageConsolidationsMember
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
10.00%uhal_ManagementFeesRateHighest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMercuryFourSacFiveSacGalaxyAndPrivateMiniMember
/ us-gaap_StatementBusinessSegmentsAxis
= uhal_MovingAndStorageConsolidationsMember
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoBusinessSegmentMember
Operating Segments [Member] | Moving and Storage Operating Segment [Member] | Amerco, Uhaul Intl [Member] | Private Mini [Member]      
Related party notes receivable:      
Cash interest payments 5,100,000us-gaap_ProceedsFromInterestReceived
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_PrivateMiniMember
/ us-gaap_StatementBusinessSegmentsAxis
= uhal_MovingAndStorageConsolidationsMember
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoUhaulIntlMember
5,400,000us-gaap_ProceedsFromInterestReceived
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_PrivateMiniMember
/ us-gaap_StatementBusinessSegmentsAxis
= uhal_MovingAndStorageConsolidationsMember
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoUhaulIntlMember
5,400,000us-gaap_ProceedsFromInterestReceived
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_PrivateMiniMember
/ us-gaap_StatementBusinessSegmentsAxis
= uhal_MovingAndStorageConsolidationsMember
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoUhaulIntlMember
Notes receivable outstanding 56,500,000us-gaap_NotesReceivableRelatedParties
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_PrivateMiniMember
/ us-gaap_StatementBusinessSegmentsAxis
= uhal_MovingAndStorageConsolidationsMember
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoUhaulIntlMember
   
Largest aggregate balance in reporting period 65,500,000uhal_LargestAggregateBalanceInReportingPeriod
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_PrivateMiniMember
/ us-gaap_StatementBusinessSegmentsAxis
= uhal_MovingAndStorageConsolidationsMember
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoUhaulIntlMember
   
Related party repayments and interest receivables 9,000,000us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_PrivateMiniMember
/ us-gaap_StatementBusinessSegmentsAxis
= uhal_MovingAndStorageConsolidationsMember
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_AmercoUhaulIntlMember
   
Operating Segments [Member] | Moving and Storage Operating Segment [Member] | Various Subsidiaries of Amerco [Member] | Sac Holdings [Member]      
Related party notes receivable:      
Cash interest payments 5,700,000us-gaap_ProceedsFromInterestReceived
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMember
/ us-gaap_StatementBusinessSegmentsAxis
= uhal_MovingAndStorageConsolidationsMember
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_VariousSubsidiariesOfAmercoMember
17,200,000us-gaap_ProceedsFromInterestReceived
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMember
/ us-gaap_StatementBusinessSegmentsAxis
= uhal_MovingAndStorageConsolidationsMember
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_VariousSubsidiariesOfAmercoMember
12,600,000us-gaap_ProceedsFromInterestReceived
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMember
/ us-gaap_StatementBusinessSegmentsAxis
= uhal_MovingAndStorageConsolidationsMember
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_VariousSubsidiariesOfAmercoMember
Notes receivable outstanding 50,400,000us-gaap_NotesReceivableRelatedParties
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMember
/ us-gaap_StatementBusinessSegmentsAxis
= uhal_MovingAndStorageConsolidationsMember
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_VariousSubsidiariesOfAmercoMember
   
Largest aggregate balance in reporting period 71,500,000uhal_LargestAggregateBalanceInReportingPeriod
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMember
/ us-gaap_StatementBusinessSegmentsAxis
= uhal_MovingAndStorageConsolidationsMember
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_VariousSubsidiariesOfAmercoMember
   
One time cash interest proceeds   10,400,000uhal_OneTimeCashInterestProceedsReceived
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMember
/ us-gaap_StatementBusinessSegmentsAxis
= uhal_MovingAndStorageConsolidationsMember
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_VariousSubsidiariesOfAmercoMember
 
Related party repayments and interest receivables $ 20,200,000us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMember
/ us-gaap_StatementBusinessSegmentsAxis
= uhal_MovingAndStorageConsolidationsMember
/ us-gaap_SubsegmentsConsolidationItemsAxis
= uhal_VariousSubsidiariesOfAmercoMember
   
Earliest maturity year 2017 2017 2017