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v2.4.1.9

Deferred Method of Accounting for Major Overhaul (Details) (Engine and Transmission Overhaul [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Engine and Transmission Overhaul [Member] |  |  |
Capitalized and amortized: |  |  |
Net amount of (gains) losses netted against depreciation expense | $ (74.6)us-gaap_GainsLossesOnSalesOfAssets / us-gaap_PropertyPlantAndEquipmentByTypeAxis = uhal_EngineAndTransmissionOverhaulMember | $ (33.6)us-gaap_GainsLossesOnSalesOfAssets / us-gaap_PropertyPlantAndEquipmentByTypeAxis = uhal_EngineAndTransmissionOverhaulMember | $ (22.5)us-gaap_GainsLossesOnSalesOfAssets / us-gaap_PropertyPlantAndEquipmentByTypeAxis = uhal_EngineAndTransmissionOverhaulMember

X
- Details
Name: | uhal_CapitalizedAndAmortizedAbstract
Namespace Prefix: | uhal_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of gain (loss) on sale or disposal of assets utilized in financial service operations. + References No definition available. + Details
Name: | us-gaap_GainsLossesOnSalesOfAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration