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Rental Truck Depreciation Data (Details) (Rental Trucks [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015
Rental Trucks [Member] |
Schedule of rental trucks depreciation: |
Salvage value percentage | 15.00%us-gaap_PropertyPlantAndEquipmentSalvageValuePercentage / us-gaap_PropertyPlantAndEquipmentByTypeAxis = uhal_RentalTrucksMember
Percentage reduction for year one, depreciation | 16.00%uhal_PercentageReductionForYearOneDepreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = uhal_RentalTrucksMember
Percentage reduction for year two, depreciation | 13.00%uhal_PercentageReductionForYearTwoDepreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = uhal_RentalTrucksMember
Percentage reduction for year three, depreciation | 11.00%uhal_PercentageReductionForYearThreeDepreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = uhal_RentalTrucksMember
Percentage reduction for year four, depreciation | 9.00%uhal_PercentageReductionForYearFourDepreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = uhal_RentalTrucksMember
Percentage reduction for year five, depreciation | 8.00%uhal_PercentageReductionForYearFiveDepreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = uhal_RentalTrucksMember
Percentage reduction for year six, depreciation | 7.00%uhal_PercentageReductionForYearSixDepreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = uhal_RentalTrucksMember
Percentage reduction for year seven, depreciation | 6.00%uhal_PercentageReductionForYearSevenDepreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = uhal_RentalTrucksMember
Percentage reduction if straight line approach used each year for depreciation calculation | 5.70%uhal_PercentageReductionIfStraightLineApproachUsedEachYearForDepreciationCalculation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = uhal_RentalTrucksMember
Month and year depreciation method changed | 2012-10
Salvage value percentage under the old declining balance method | 20.00%uhal_SalvageValuePercentageUsingDecliningBalanceMethod / us-gaap_PropertyPlantAndEquipmentByTypeAxis = uhal_RentalTrucksMember
Depreciation expense, extension of useful lives, rental equipment | $ 3.2 uhal_DepreciationExpenseExtensionOfUsefulLifeRentalEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = uhal_RentalTrucksMember

X
- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets for the extension of the assets useful lives. + References No definition available. + Details
Name: | uhal_DepreciationExpenseExtensionOfUsefulLifeRentalEquipment
Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The percentage reduction in year five of the book value of a rental truck. + References No definition available. + Details
Name: | uhal_PercentageReductionForYearFiveDepreciation
Namespace Prefix: | uhal_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage reduction in year four of the book value of a rental truck. + References No definition available. + Details
Name: | uhal_PercentageReductionForYearFourDepreciation
Namespace Prefix: | uhal_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage reduction in year one of the book value of a rental truck. + References No definition available. + Details
Name: | uhal_PercentageReductionForYearOneDepreciation
Namespace Prefix: | uhal_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage reduction in year seven of the book value of a rental truck. + References No definition available. + Details
Name: | uhal_PercentageReductionForYearSevenDepreciation
Namespace Prefix: | uhal_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage reduction in year six of the book value of a rental truck. + References No definition available. + Details
Name: | uhal_PercentageReductionForYearSixDepreciation
Namespace Prefix: | uhal_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage reduction in year three of the book value of a rental truck. + References No definition available. + Details
Name: | uhal_PercentageReductionForYearThreeDepreciation
Namespace Prefix: | uhal_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage reduction in year two of the book value of a rental truck. + References No definition available. + Details
Name: | uhal_PercentageReductionForYearTwoDepreciation
Namespace Prefix: | uhal_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage reduction using the straight line approach for each year. + References No definition available. + Details
Name: | uhal_PercentageReductionIfStraightLineApproachUsedEachYearForDepreciationCalculation
Namespace Prefix: | uhal_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition What the salvage value would be if we continued calculating depreciation under the declining balance method. + References No definition available. + Details
Name: | uhal_SalvageValuePercentageUsingDecliningBalanceMethod
Namespace Prefix: | uhal_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition We changed the salvage value for new trucks added to fleet. + References No definition available. + Details
Name: | uhal_YearOfSalvageValueChange
Namespace Prefix: | uhal_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stated as a percentage, the estimated or actual value of the asset at the end of its useful life or when it is no longer serviceable (cannot be used for its original purpose) divided by its [historical] capitalized cost. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentSalvageValuePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant