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Accounting Pronouncements (Narratives) (Details) $ in Thousands | 3 Months Ended
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Jun. 30, 2020 USD ($)
Allowance For Credit Loss [Abstract] |
Allowance For Doubtful Accounts Provision For Credit Losses | $ 2,880

X
- References No definition available. + Details
Name: | uhal_AllowanceForDoubtfulAccountsProvisionForCreditLosses
Namespace Prefix: | uhal_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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