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Related Party Notes Receivable and Management Fees [Text] (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014
Related party notes receivable: |  |  |  |  |
One time cash interest proceeds | $ 10,400,000 uhal_OneTimeCashInterestProceedsReceived |  |  |  |
Earliest maturity year | 2017 |  |  |  |
Sac Holdings [Member] |  |  |  |  |
Related party notes receivable: |  |  |  |  |
Notes receivable outstanding |  | 50,708,000 us-gaap_NotesReceivableRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMember | 50,708,000 us-gaap_NotesReceivableRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMember |  | 71,464,000 us-gaap_NotesReceivableRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMember
Various Subsidiaries of Amerco [Member] | Sac Holdings [Member] |  |  |  |  |
Related party notes receivable: |  |  |  |  |
Cash interest payments |  |  | 4,600,000 us-gaap_ProceedsFromInterestReceived / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMember / us-gaap_StatementBusinessSegmentsAxis = uhal_VariousSubsidiariesOfAmercoMember | 15,600,000 us-gaap_ProceedsFromInterestReceived / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMember / us-gaap_StatementBusinessSegmentsAxis = uhal_VariousSubsidiariesOfAmercoMember |
Notes receivable outstanding |  | 50,700,000 us-gaap_NotesReceivableRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMember / us-gaap_StatementBusinessSegmentsAxis = uhal_VariousSubsidiariesOfAmercoMember | 50,700,000 us-gaap_NotesReceivableRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMember / us-gaap_StatementBusinessSegmentsAxis = uhal_VariousSubsidiariesOfAmercoMember |  |
Largest aggregate balance in reporting period |  | 71,500,000 uhal_LargestAggregateBalanceInReportingPeriod / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMember / us-gaap_StatementBusinessSegmentsAxis = uhal_VariousSubsidiariesOfAmercoMember | 71,500,000 uhal_LargestAggregateBalanceInReportingPeriod / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMember / us-gaap_StatementBusinessSegmentsAxis = uhal_VariousSubsidiariesOfAmercoMember |  |
Related party repayments and interest receivables |  |  | 20,200,000 us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMember / us-gaap_StatementBusinessSegmentsAxis = uhal_VariousSubsidiariesOfAmercoMember |  |
Earliest maturity year |  | 2017 |  |  |
Amerco, Uhaul Intl [Member] | Private Mini [Member] |  |  |  |  |
Related party notes receivable: |  |  |  |  |
Cash interest payments |  |  | 4,000,000 us-gaap_ProceedsFromInterestReceived / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_PrivateMiniMember / us-gaap_StatementBusinessSegmentsAxis = uhal_AmercoUhaulIntlMember | 4,000,000 us-gaap_ProceedsFromInterestReceived / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_PrivateMiniMember / us-gaap_StatementBusinessSegmentsAxis = uhal_AmercoUhaulIntlMember |
Notes receivable outstanding |  | 56,500,000 us-gaap_NotesReceivableRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_PrivateMiniMember / us-gaap_StatementBusinessSegmentsAxis = uhal_AmercoUhaulIntlMember | 56,500,000 us-gaap_NotesReceivableRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_PrivateMiniMember / us-gaap_StatementBusinessSegmentsAxis = uhal_AmercoUhaulIntlMember |  |
Largest aggregate balance in reporting period |  | 65,500,000 uhal_LargestAggregateBalanceInReportingPeriod / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_PrivateMiniMember / us-gaap_StatementBusinessSegmentsAxis = uhal_AmercoUhaulIntlMember | 65,500,000 uhal_LargestAggregateBalanceInReportingPeriod / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_PrivateMiniMember / us-gaap_StatementBusinessSegmentsAxis = uhal_AmercoUhaulIntlMember |  |
Related party repayments and interest receivables |  |  | 9,000,000 us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_PrivateMiniMember / us-gaap_StatementBusinessSegmentsAxis = uhal_AmercoUhaulIntlMember |  |
AMERCO [Member] | Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] |  |  |  |  |
Management fees revenue: |  |  |  |  |
Management fees received exclusive of reimbursed expenses |  |  | $ 20,600,000 us-gaap_ManagementFeesBaseRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMercuryFourSacFiveSacGalaxyAndPrivateMiniMember / us-gaap_StatementBusinessSegmentsAxis = uhal_AmercoBusinessSegmentMember | $ 20,800,000 us-gaap_ManagementFeesBaseRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMercuryFourSacFiveSacGalaxyAndPrivateMiniMember / us-gaap_StatementBusinessSegmentsAxis = uhal_AmercoBusinessSegmentMember |
Management fee rate, lowest |  | 4.00%uhal_RelatedPartyTransactionRateLowest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMercuryFourSacFiveSacGalaxyAndPrivateMiniMember / us-gaap_StatementBusinessSegmentsAxis = uhal_AmercoBusinessSegmentMember | 4.00%uhal_RelatedPartyTransactionRateLowest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMercuryFourSacFiveSacGalaxyAndPrivateMiniMember / us-gaap_StatementBusinessSegmentsAxis = uhal_AmercoBusinessSegmentMember |  |
Management fee rate, highest |  | 10.00%uhal_ManagementFeesRateHighest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMercuryFourSacFiveSacGalaxyAndPrivateMiniMember / us-gaap_StatementBusinessSegmentsAxis = uhal_AmercoBusinessSegmentMember | 10.00%uhal_ManagementFeesRateHighest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMercuryFourSacFiveSacGalaxyAndPrivateMiniMember / us-gaap_StatementBusinessSegmentsAxis = uhal_AmercoBusinessSegmentMember |  |

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- Definition We provide the largest aggregate amount of related party notes receivable that occurred during this reporting period. This can be compared to the related party notes receivable balance at the end of this period. + References No definition available. + Details
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- Definition The US-GAAP taxonomy only contains a single rate for related party transactions: RelatedPartyTransactionRate. We disclose a range of rates for management fees. + References No definition available. + Details
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- Definition One time interest payment received on loans and other debt instruments. + References No definition available. + Details
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- Details
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- Definition The US-GAAP taxonomy only contains a single date for related party transactions. RelatedPartyTransaction Date. We disclose our earliest and latest maturities on the various outstanding notes only by the year. + References No definition available. + Details
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- Definition The US-GAAP taxonomy only contains a single rate for related party transactions: RelatedPartyTransactionRate. We disclose a range of rates for management fees. + References No definition available. + Details
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- Definition Reflects the amount of collections received from related parties to reduce the carrying amounts of loans and leases receivable due from them. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(e)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph e -Article 9 + Details
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- Definition Base revenue, as contractually stipulated, for operating and managing another entity's business during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition For an unclassified balance sheet, amounts due from parties associated with the reporting entity as evidenced by a written promise to pay. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.3) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Related Parties -URI http://asc.fasb.org/extlink&oid=16382449 + Details
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- Definition Interest received on loans and other debt instruments during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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