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Maximum Amount of Life Insurance Retained on Any One Life (Details) (USD $) | 12 Months Ended
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Mar. 31, 2015
Reinsurance Disclosures [Abstract] |
Maximum amount of life insurance retained on any one life | $ 110,000 uhal_MaximumAmountOfLifeInsuranceRetainedOnAnyOneLife

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- Definition During their normal course of business, our insurance subsidiaries assume and cede reinsurance on both a coinsurance and a risk premium basis. They also obtain reinsurance for that portion of risks exceeding their retention limits. This concept provides the maximum amount of life insurance retained on any one life by these insurance subsidiaries. + References No definition available. + Details
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Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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