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Calculation of Earnings Per Share - Additional Information (Detail)
 3 Months Ended 6 Months Ended
Nov. 29, 2014
Nov. 30, 2013
Nov. 29, 2014
Nov. 30, 2013
Computation Of Earnings Per Share Line Items        
Common stock options anti-dilutive 666,564us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 512,064us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 661,564us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 487,064us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Common Stock        
Computation Of Earnings Per Share Line Items        
Common stock shares, authorized 17,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		   17,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		  
Class B Common Stock        
Computation Of Earnings Per Share Line Items        
Common stock shares, authorized 3,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		   3,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		  
Number of votes for Class B common stock     10rell_NumberOfVotesForClassBCommonStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		  
Cash dividends Class A common stock     90.00%rell_CashDividendsClassCommonStockPercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember