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Lease Obligations and Other Commitments - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	May 27, 2023	May 28, 2022	May 29, 2021
Commitments and Contingencies Disclosure [Abstract]
Rent expense	$ 1.5	$ 1.6	$ 1.7

X

- Definition

Lease expense.

+ References

No definition available.

+ Details

Name:	rell_LeaseExpense
Namespace Prefix:	rell_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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