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Risks and Uncertainties - Additional Information (Details) $ in Millions | 12 Months Ended
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May 29, 2021 USD ($)
Risks And Uncertainties [Abstract] |
Payment for litigation settlement | $ 1.6
Deferred employer social security tax payments | $ 0.9

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- Definition Social security tax employer deferral CARES Act. + References No definition available. + Details
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Namespace Prefix: | rell_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount awarded to other party in judgment or settlement of litigation. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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