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Related Party Assets (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Mar. 31, 2014
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Related party assets: |  |  |  |
U-Haul receivables | $ 8,897 us-gaap_OtherReceivables |  | $ 4,177 us-gaap_OtherReceivables |
Related party assets | 141,790 us-gaap_DueFromRelatedParties |  | 169,624 us-gaap_DueFromRelatedParties |
Sac Holdings [Member] |  |  |  |
Related party assets: |  |  |  |
Notes receivable | 50,428 us-gaap_NotesReceivableRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMember |  | 71,464 us-gaap_NotesReceivableRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMember |
U-Haul interest receivable | 4,579 us-gaap_InterestReceivable / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMember |  | 4,376 us-gaap_InterestReceivable / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMember |
U-Haul receivables | 20,108 us-gaap_OtherReceivables / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMember |  | 19,418 us-gaap_OtherReceivables / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_SacHoldingsMember |
Private Mini [Member] |  |  |  |
Related party assets: |  |  |  |
U-Haul notes, receivables and interest | 59,375 us-gaap_NotesReceivableNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_PrivateMiniMember |  | 68,451 us-gaap_NotesReceivableNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_PrivateMiniMember |
Mercury [Member] |  |  |  |
Related party assets: |  |  |  |
U-Haul receivables | 6,667 us-gaap_OtherReceivables / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_MercuryMember |  | 5,930 us-gaap_OtherReceivables / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_MercuryMember |
Insurance Subsidiaries [Member] |  |  |  |
Related party assets: |  |  |  |
Other | $ 633 uhal_TimingDifferenceInsuranceSubsidiaries / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_InsuranceSubsidiariesMember | [1] | $ (15)uhal_TimingDifferenceInsuranceSubsidiaries / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = uhal_InsuranceSubsidiariesMember | [1]
[1] | Timing differences for intercompany balances with insurance subsidiaries

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- Definition Timing difference for interecompany balances with insurance subsidiaries. The balance includes the redemption of our Preferred stock. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds. + 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 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 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 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 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 3: 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 4: 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 Carrying amounts due as of the balance sheet date from parties or arising from transactions not otherwise specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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