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Adjusted Cost and Estimated Market Value Available-for-sale Investments (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Mar. 31, 2014
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Available-for-sale securities, amortized cost: |  |
Amortized cost | $ 1,237,386 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 1,135,544 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale securities, fair value: |  |
Estimated market value | 1,304,962 us-gaap_MarketableSecurities | 1,138,275 us-gaap_MarketableSecurities
US Government and Corporate Securities [Member] |  |
Available-for-sale securities, amortized cost: |  |
Due in one year or less | 36,355 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uhal_USGovernmentCorporateSecuritiesMember | 20,235 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uhal_USGovernmentCorporateSecuritiesMember
Due after one year through five years | 198,488 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uhal_USGovernmentCorporateSecuritiesMember | 185,447 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uhal_USGovernmentCorporateSecuritiesMember
Due after five years through ten years | 474,639 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uhal_USGovernmentCorporateSecuritiesMember | 350,048 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uhal_USGovernmentCorporateSecuritiesMember
Due after ten years | 472,003 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uhal_USGovernmentCorporateSecuritiesMember | 531,645 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uhal_USGovernmentCorporateSecuritiesMember
Amortized cost | 1,181,485 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uhal_USGovernmentCorporateSecuritiesMember | 1,087,375 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uhal_USGovernmentCorporateSecuritiesMember
Available-for-sale securities, fair value: |  |
Due in one year or less | 37,055 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uhal_USGovernmentCorporateSecuritiesMember | 20,475 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uhal_USGovernmentCorporateSecuritiesMember
Due after one year through five years | 209,404 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uhal_USGovernmentCorporateSecuritiesMember | 194,563 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uhal_USGovernmentCorporateSecuritiesMember
Due after five years through ten years | 492,782 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uhal_USGovernmentCorporateSecuritiesMember | 350,953 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uhal_USGovernmentCorporateSecuritiesMember
Due after ten years | 502,092 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uhal_USGovernmentCorporateSecuritiesMember | 521,289 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uhal_USGovernmentCorporateSecuritiesMember
Estimated market value | 1,241,333 us-gaap_MarketableSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uhal_USGovernmentCorporateSecuritiesMember | 1,087,280 us-gaap_MarketableSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = uhal_USGovernmentCorporateSecuritiesMember
Mortgage backed securities [Member] |  |
Available-for-sale securities, amortized cost: |  |
Amortized cost | 19,874 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember | 12,425 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember
Available-for-sale securities, fair value: |  |
Estimated market value | 20,679 us-gaap_MarketableSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember | 12,187 us-gaap_MarketableSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember
Redeemable Preferred Stocks [Member] |  |
Available-for-sale securities, amortized cost: |  |
Amortized cost | 18,052 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_RedeemablePreferredStockMember | 18,445 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_RedeemablePreferredStockMember
Available-for-sale securities, fair value: |  |
Estimated market value | 18,296 us-gaap_MarketableSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_RedeemablePreferredStockMember | 17,533 us-gaap_MarketableSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_RedeemablePreferredStockMember
Equity Securities [Member] |  |
Available-for-sale securities, amortized cost: |  |
Amortized cost | 17,975 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 17,299 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Available-for-sale securities, fair value: |  |
Estimated market value | $ 24,654 us-gaap_MarketableSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | $ 21,275 us-gaap_MarketableSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember

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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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