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Earnings Per Share - Additional Information (Details) - shares shares in Thousands	3 Months Ended
	Aug. 30, 2025	Aug. 31, 2024
Schedule Of Earning Per Share [Line Items]
Limit of cash dividends Class A common stock (percent)	90.00%
Limit of cash dividends Class B common stock (percent)	90.00%
Common stock options anti-dilutive	0	0

X

- Definition

Limit of cash dividends class A common stock.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

The percentage rate of Class A dividends as computed for Class B dividend limitation.

+ References

No definition available.

+ Details

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Namespace Prefix:	rell_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Schedule of earning per share.

+ References

No definition available.

+ Details

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Namespace Prefix:	rell_
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Balance Type:	na
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X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482662/260-10-50-1

+ Details

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Period Type:	duration