Name:	uhal_DepreciationExpenseExtensionOfUsefulLifeRentalEquipment
Namespace Prefix:	uhal_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The percentage reduction in year five of the book value of a rental truck.

No definition available.

Name:	uhal_PercentageReductionForYearFiveDepreciation
Namespace Prefix:	uhal_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The percentage reduction in year four of the book value of a rental truck.

No definition available.

Name:	uhal_PercentageReductionForYearFourDepreciation
Namespace Prefix:	uhal_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The percentage reduction in year one of the book value of a rental truck.

No definition available.

Name:	uhal_PercentageReductionForYearOneDepreciation
Namespace Prefix:	uhal_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The percentage reduction in year seven of the book value of a rental truck.

No definition available.

Name:	uhal_PercentageReductionForYearSevenDepreciation
Namespace Prefix:	uhal_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The percentage reduction in year six of the book value of a rental truck.

No definition available.

Name:	uhal_PercentageReductionForYearSixDepreciation
Namespace Prefix:	uhal_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The percentage reduction in year three of the book value of a rental truck.

No definition available.

Name:	uhal_PercentageReductionForYearThreeDepreciation
Namespace Prefix:	uhal_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The percentage reduction in year two of the book value of a rental truck.

No definition available.

Name:	uhal_PercentageReductionForYearTwoDepreciation
Namespace Prefix:	uhal_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The percentage reduction using the straight line approach for each year.

No definition available.

Name:	uhal_PercentageReductionIfStraightLineApproachUsedEachYearForDepreciationCalculation
Namespace Prefix:	uhal_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

What the salvage value would be if we continued calculating depreciation under the declining balance method.

No definition available.

Name:	uhal_SalvageValuePercentageUsingDecliningBalanceMethod
Namespace Prefix:	uhal_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	uhal_ScheduleOfRentalTrucksDepreciationAbstract
Namespace Prefix:	uhal_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

We changed the salvage value for new trucks added to fleet.

No definition available.

Name:	uhal_YearOfSalvageValueChange
Namespace Prefix:	uhal_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

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.

No definition available.