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Operating Results by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Feb. 28, 2015
Mar. 01, 2014
Feb. 28, 2015
Mar. 01, 2014
Segment Reporting Information [Line Items]        
Net Sales $ 33,471us-gaap_SalesRevenueNet $ 32,884us-gaap_SalesRevenueNet $ 102,011us-gaap_SalesRevenueNet $ 102,577us-gaap_SalesRevenueNet
Gross Profit 9,800us-gaap_GrossProfit 9,651us-gaap_GrossProfit 30,920us-gaap_GrossProfit 30,850us-gaap_GrossProfit
EDG        
Segment Reporting Information [Line Items]        
Net Sales 25,207us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_ElectronDeviceGroupMember		 24,193us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_ElectronDeviceGroupMember		 79,432us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_ElectronDeviceGroupMember		 75,835us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_ElectronDeviceGroupMember
Gross Profit 7,680us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_ElectronDeviceGroupMember		 7,139us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_ElectronDeviceGroupMember		 24,904us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_ElectronDeviceGroupMember		 23,505us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_ElectronDeviceGroupMember
Canvys        
Segment Reporting Information [Line Items]        
Net Sales 6,236us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_CanvysMember		 6,732us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_CanvysMember		 18,110us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_CanvysMember		 21,769us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_CanvysMember
Gross Profit 1,621us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_CanvysMember		 1,945us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_CanvysMember		 4,929us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_CanvysMember		 5,970us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_CanvysMember
Healthcare [Domain]        
Segment Reporting Information [Line Items]        
Net Sales 2,028us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_HealthcareDomain		 1,959us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_HealthcareDomain		 4,469us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_HealthcareDomain		 4,973us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_HealthcareDomain
Gross Profit $ 499us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_HealthcareDomain		 $ 567us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_HealthcareDomain		 $ 1,087us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_HealthcareDomain		 $ 1,375us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_HealthcareDomain