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Rental Truck Depreciation Data (Details) (Rental Trucks [Member]) | 12 Months Ended
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Mar. 31, 2014
Rental Trucks [Member] |
Schedule of rental trucks depreciation: |
Salvage value percentage | 15.00%
Percentage reduction for year one, depreciation | 16.00%
Percentage reduction for year two, depreciation | 13.00%
Percentage reduction for year three, depreciation | 11.00%
Percentage reduction for year four, depreciation | 9.00%
Percentage reduction for year five, depreciation | 8.00%
Percentage reduction for year six, depreciation | 7.00%
Percentage reduction for year seven, depreciation | 6.00%
Percentage reduction if straight line approach used each year for depreciation calculation | 5.70%
Month and year depreciation method changed | 2012-10
Salvage value percentage under the old declining balance method | 20.00%

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