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Schedule V, AMERCO and Consolidated Subsidiaries, Supplemental Information (for Property-Casualty Insurance Operations), Parenthetical (Details) (USD $) | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Premiums earned and written net of intersegment transactions: |  |  |
Earned premiums eliminated | $ 15,484,000 us-gaap_AssumedPremiumsEarned | $ 16,910,000 us-gaap_AssumedPremiumsEarned | $ 20,155,000 us-gaap_AssumedPremiumsEarned
Consolidated Property and Casualty Insurance Entity [Member] | AMERCO [Member] |  |  |
Premiums earned and written net of intersegment transactions: |  |  |
Earned premiums eliminated | 0 us-gaap_AssumedPremiumsEarned / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember | 0 us-gaap_AssumedPremiumsEarned / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember | 0 us-gaap_AssumedPremiumsEarned / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember
Net investment income excludes net realized (gains) losses on investments: |  |  |
Investment Income | $ (800,000)us-gaap_GainLossOnInvestments / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember | $ (500,000)us-gaap_GainLossOnInvestments / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember | $ (4,900,000)us-gaap_GainLossOnInvestments / us-gaap_SubsegmentsConsolidationItemsAxis = uhal_AmercoBusinessSegmentMember / us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersByAffiliationWithRegistrantAxis = us-gaap_ConsolidatedPropertyAndCasualtyInsuranceEntityMember

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- Definition Amount of earned premiums assumed from other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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