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Contingencies (Narratives) (Details) $ in Millions | 9 Months Ended
--- | ---
Dec. 31, 2021 USD ($)
Covid 19 pandemic |
Unusual Or Infrequent Item Net Gain Loss [Abstract] |
CARES act, estimated refund amount | $ 366.0

X
- Definition Estimated net operating loss carrybacks, depreciation adjustments reflected in Prepaid expense. + References No definition available. + Details
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Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |