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Total Notional Amount Variable Interest Rate Swap (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015
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Interest Rate Derivatives [Abstract] |
Total notional amount of Company's variable interest rate swaps | $ 333.7 us-gaap_DerivativeLiabilityNotionalAmount
Notional amount of operating lease | $ 10.8 uhal_NotionalAmountOnOperatingLeaseDerivatives

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- Definition Aggregate notional amount on operating lease derivatives, which relates to the currency amount specified on operating lease derivatives. + References No definition available. + Details
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Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5580258-113959 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_InterestRateDerivativesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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