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Related Party Revenue (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Related party transactions:        
Management fees revenue $ 7,497us-gaap_ManagementFeesRevenue $ 7,133us-gaap_ManagementFeesRevenue $ 18,970us-gaap_ManagementFeesRevenue $ 17,586us-gaap_ManagementFeesRevenue
Revenue from related parties 9,896us-gaap_RevenueFromRelatedParties 10,210us-gaap_RevenueFromRelatedParties 27,458us-gaap_RevenueFromRelatedParties 27,001us-gaap_RevenueFromRelatedParties
Sac Holdings [Member]        
Related party transactions:        
Interest income revenue 1,261us-gaap_InterestIncomeOperating
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMember
1,730us-gaap_InterestIncomeOperating
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMember
4,684us-gaap_InterestIncomeOperating
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMember
5,382us-gaap_InterestIncomeOperating
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMember
Management fees revenue 4,168us-gaap_ManagementFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMember
3,976us-gaap_ManagementFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMember
13,313us-gaap_ManagementFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMember
12,238us-gaap_ManagementFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_SacHoldingsMember
Private Mini [Member]        
Related party transactions:        
Interest income revenue 1,138us-gaap_InterestIncomeOperating
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_PrivateMiniMember
1,347us-gaap_InterestIncomeOperating
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_PrivateMiniMember
3,804us-gaap_InterestIncomeOperating
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_PrivateMiniMember
4,033us-gaap_InterestIncomeOperating
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_PrivateMiniMember
Management fees revenue 659us-gaap_ManagementFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_PrivateMiniMember
614us-gaap_ManagementFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_PrivateMiniMember
1,943us-gaap_ManagementFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_PrivateMiniMember
1,812us-gaap_ManagementFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_PrivateMiniMember
Mercury [Member]        
Related party transactions:        
Management fees revenue $ 2,670us-gaap_ManagementFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_MercuryMember
$ 2,543us-gaap_ManagementFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_MercuryMember
$ 3,714us-gaap_ManagementFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_MercuryMember
$ 3,536us-gaap_ManagementFeesRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= uhal_MercuryMember