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

X

- Definition

Social security tax employer deferral CARES Act.

+ References

No definition available.

+ Details

Name:	rell_SocialSecurityTaxEmployerDeferralCARESAct
Namespace Prefix:	rell_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementAmountAwardedToOtherParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_RisksAndUncertaintiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration