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Revenue Recognition - Additional Information (Details) | 9 Months Ended
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Feb. 29, 2020
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

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- Definition Revenue recognition. + References No definition available. + Details
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Namespace Prefix: | rell_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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

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- 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

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- 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: |