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Postretirement Life and Medical Insurance Benefits to Eligible Retirees (Details) (USD $) | 12 Months Ended
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Mar. 31, 2014 age
Health insurance |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |
Deferred compensation arrangement with individuals, description | Retirees must have attained age sixty-five and earned twenty years of full-time service upon retirment for coverage under the medical plan. The medical benefits are capped at a $20,000 lifetime maximum per covered person. The benefits are coordinated with Medicare and any other medical policies in force.
Age requirement for retiring | 65
Deferred compensation arrangement with individual, requisite service period | Twenty years
Lifetime maximum benefit paid per individual | $ 20,000
Life insurance |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |
Deferred compensation arrangement with individuals, description | Retirees who have attained the age sixty-five and earned at least ten years of full-time service upon retirement from the Company are entitled to group term life insurance benefits. The life insruance benefit is $2,000 plus $100 for each year of employment over ten years. The plan is not funed and claims are paid as they are incurred
Age requirement for retiring | 65
Deferred compensation arrangement with individual, requisite service period | Ten years
Lifetime maximum benefit paid per individual | 2,000
Additional benefit stipulation for life insurance | 10 years 0 months 0 days
Additional benefit requirement amount | $ 100

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- Definition Additional amount provided to retiree's for each year of server over ten years. + References No definition available. + Details
Name: | uhal_AdditionalBenefitRequirementAmount
Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition An additional benefit provided to an individual whole service continues after the requisite service period in increments of 10 years. This is set as a durationItemType, P10Y0M0D is the format. + References No definition available. + Details
Name: | uhal_AdditionalBenefitStipulationForLifeInsurance
Namespace Prefix: | uhal_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition An employee retiring from our corporation must be 65 years of age. + References No definition available. + Details
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Data Type: | xbrli:nonNegativeIntegerItemType
Balance Type: | na
Period Type: | duration

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- Definition The maximum amount an individual receives as an insurance benefit after completing the requisite number of years of service and having reached the requisite age. + References No definition available. + Details
Name: | uhal_LifetimeMaximumBenefitPaidPerIndividual
Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition Description of the deferred compensation arrangement, including fixed amounts and determinable awards, or the method for determining payments and awards, the timing of such payments and awards, and any requisite service or performance criteria, as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 + Details
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Balance Type: | na
Period Type: | duration

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The minimum period that the individual is required to perform services in order to be fully vested under the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Namespace Prefix: | us-gaap_
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