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Financial Instruments with Potential Credit Risk, Cash Deposits (Details) (USD $) | Mar. 31, 2013
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Cash, Insured and Uninsured [Abstract] |
Cash, FDIC insured amount | $ 250,000
Cash, CDIC insured amount | $ 100,000

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- Definition The insured amount by Canadian financial institutions. It is insured by the Canada Deposit Insurance Corporation ("CDIC"). This is the maximum amount issued by this institution. + References No definition available. + Details
Name: | uhal_CashCdicInsuredAmount
Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
Name: | us-gaap_CashFDICInsuredAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_CashInsuredAndUninsuredAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration