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Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Nov. 29, 2014 | Nov. 30, 2013 | May 31, 2014
Investment [Line Items] |  |  |
Investment in time deposits and certificate of deposits | $ 34.9 rell_InvestmentInTimeDepositsAndCertificateOfDeposits |  | $ 32.7 rell_InvestmentInTimeDepositsAndCertificateOfDeposits
Investment in time deposits and certificate of deposits, less than twelve months | 23.4 rell_InvestmentInTimeDepositsAndCertificateOfDepositsCurrent |  | 31.7 rell_InvestmentInTimeDepositsAndCertificateOfDepositsCurrent
Investment in time deposits and certificate of deposits, greater than twelve months | 11.5 rell_InvestmentInTimeDepositsAndCertificateOfDepositsNonCurrent |  | 1.0 rell_InvestmentInTimeDepositsAndCertificateOfDepositsNonCurrent
Investments, which are included in non-current assets | $ 0.6 us-gaap_AvailableForSaleSecuritiesEquitySecurities |  | $ 0.5 us-gaap_AvailableForSaleSecuritiesEquitySecurities
Proceeds from the sale of securities description | less than $0.1 million | 0.1 |
Gross realized gains and losses on sale, description | less than $0.1 million | less than $0.1 million |
Net unrealized holding gains, description | less than $0.1 million | less than $0.1 million |

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- Details
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- Definition Available for sale securities gross realized gain loss description. + References No definition available. + Details
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- Definition Investment in time deposits and certificate of deposits. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Investment in time deposits and certificate of deposits current. + References No definition available. + Details
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- Definition Investment in time deposits and certificate of deposits non current. + References No definition available. + Details
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- Definition Other comprehensive income unrealized holding gain loss on securities arising during period net of tax description. + References No definition available. + Details
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- Definition Proceeds from Sale of Available for Sale Securities Equity Description + References No definition available. + Details
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Namespace Prefix: | rell_
Data Type: | xbrli:stringItemType
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- Definition Amount of equity securities categorized neither as held-to-maturity nor as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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