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Contingencies (Narratives) (Details) $ in Millions | 12 Months Ended
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Mar. 31, 2021 USD ($)
Covid 19 Pandemic |
Unusual Or Infrequent Item Net Gain Loss [Abstract] |
CARES act, refund estimate | $ 366.0

X
- Definition Amount of reasonable estimate for refund due to operating loss carrybacks, combined with depreciation adjustments pursuant to CARES act. + 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: |