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Statutory Financial Information of Insurance Subsidiaries (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Repwest [Member] |  |  |
Statutory financial information of insurance subsidiaries: |  |  |
Audit statutory net income (loss) | $ 21,287 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_RepwestMember | $ 18,286 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_RepwestMember | $ 16,923 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_RepwestMember
Audited statutory capital and surplus | 155,835 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_RepwestMember | 126,836 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_RepwestMember | 94,284 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_RepwestMember
ARCOA [Member] |  |  |
Statutory financial information of insurance subsidiaries: |  |  |
Audit statutory net income (loss) | 1,358 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_ARCOAMember | 532 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_ARCOAMember | (1,881)us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_ARCOAMember
Audited statutory capital and surplus | 4,175 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_ARCOAMember | 2,666 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_ARCOAMember | 2,201 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_ARCOAMember
Oxford [Member] |  |  |
Statutory financial information of insurance subsidiaries: |  |  |
Audit statutory net income (loss) | 12,115 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_OxfordMember | 11,130 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_OxfordMember | 13,936 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_OxfordMember
Audited statutory capital and surplus | 158,512 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_OxfordMember | 148,486 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_OxfordMember | 131,920 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_OxfordMember
CFLIC [Member] |  |  |
Statutory financial information of insurance subsidiaries: |  |  |
Audit statutory net income (loss) | 9,157 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_ChristianFidelityLifeInsuranceCompanyMember | 9,567 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_ChristianFidelityLifeInsuranceCompanyMember | 8,734 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_ChristianFidelityLifeInsuranceCompanyMember
Audited statutory capital and surplus | 28,551 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_ChristianFidelityLifeInsuranceCompanyMember | 28,848 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_ChristianFidelityLifeInsuranceCompanyMember | 28,042 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_ChristianFidelityLifeInsuranceCompanyMember
NAI [Member] |  |  |
Statutory financial information of insurance subsidiaries: |  |  |
Audit statutory net income (loss) | 886 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_NorthAmericanInsuranceCompanyMember | (419)us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_NorthAmericanInsuranceCompanyMember | (1,962)us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_NorthAmericanInsuranceCompanyMember
Audited statutory capital and surplus | $ 11,589 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_NorthAmericanInsuranceCompanyMember | $ 10,185 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_NorthAmericanInsuranceCompanyMember | $ 9,804 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = uhal_NorthAmericanInsuranceCompanyMember

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- Definition The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.23(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 24 -Subparagraph c -Article 7 + Details
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- Definition Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.23(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 24 -Subparagraph c -Article 7 + Details
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