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Revenue Recognition - Additional Information (Details)	6 Months Ended
	Nov. 30, 2019
Maximum
Revenue Recognition [Line Items]
Services revenue recognized as percentage of aggregate revenue	5.00%
Term of product warranty	3 years
Minimum
Revenue Recognition [Line Items]
Term of product warranty	1 year

X

- Definition

Revenue recognition.

+ References

No definition available.

+ Details

Name:	rell_RevenueRecognitionLineItems
Namespace Prefix:	rell_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Services revenue recognized as percentage of aggregate revenue.

+ References

No definition available.

+ Details

Name:	rell_ServicesRevenueRecognizedAsPercentageOfAggregateRevenue
Namespace Prefix:	rell_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Term of product warranty.

+ References

No definition available.

+ Details

Name:	rell_TermOfProductWarranty
Namespace Prefix:	rell_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: