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Related Party Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Mar. 31, 2014
Related party assets:    
Related party assets $ 148,776us-gaap_DueFromRelatedParties $ 169,624us-gaap_DueFromRelatedParties
Sac Holdings [Member]    
Related party assets:    
Notes receivable 50,708us-gaap_NotesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMember
71,464us-gaap_NotesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMember
U-Haul interest receivable 4,488us-gaap_InterestReceivable
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMember
4,376us-gaap_InterestReceivable
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMember
U-Haul receivables 23,128us-gaap_OtherReceivables
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMember
19,418us-gaap_OtherReceivables
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMember
Private Mini [Member]    
Related party assets:    
U-Haul notes, receivables and interest 63,433us-gaap_NotesReceivableNet
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_PrivateMiniMember
68,451us-gaap_NotesReceivableNet
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_PrivateMiniMember
Mercury [Member]    
Related party assets:    
U-Haul receivables 6,503us-gaap_OtherReceivables
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_MercuryMember
5,930us-gaap_OtherReceivables
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_MercuryMember
Insurance Group [Member]    
Related party assets:    
Other $ 516uhal_TimingDifferenceInsuranceSubsidiaries
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_InsuranceGroupMember
[1] $ (15)uhal_TimingDifferenceInsuranceSubsidiaries
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_InsuranceGroupMember
[1]
[1] Timing differences for intercompany balances with insurance subsidiaries.