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Goodwill and Other Intangible Assets - Additional Information (Detail) | 9 Months Ended
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Feb. 28, 2015
Goodwill and Intangible Assets Disclosure [Line Items] |
Weighted average number of years of amortization expense | 17 years 1 month 6 days

X
- Definition Finite lived intangible assets remaining amortization expense period. + References No definition available. + Details
Name: | rell_FiniteLivedIntangibleAssetsRemainingAmortizationExpensePeriod
Namespace Prefix: | rell_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | rell_GoodwillAndIntangibleAssetsDisclosureLineItems
Namespace Prefix: | rell_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration