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Operating Results by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Nov. 29, 2014
Nov. 30, 2013
Nov. 29, 2014
Nov. 30, 2013
Segment Reporting Information [Line Items]        
Net Sales $ 33,841us-gaap_SalesRevenueNet $ 35,436us-gaap_SalesRevenueNet $ 68,540us-gaap_SalesRevenueNet $ 69,693us-gaap_SalesRevenueNet
Gross Profit 10,462us-gaap_GrossProfit 11,007us-gaap_GrossProfit 21,120us-gaap_GrossProfit 21,199us-gaap_GrossProfit
EDG        
Segment Reporting Information [Line Items]        
Net Sales 26,787us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_ElectronDeviceGroupMember		 26,163us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_ElectronDeviceGroupMember		 54,225us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_ElectronDeviceGroupMember		 51,642us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_ElectronDeviceGroupMember
Gross Profit 8,537us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_ElectronDeviceGroupMember		 8,507us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_ElectronDeviceGroupMember		 17,223us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_ElectronDeviceGroupMember		 16,366us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_ElectronDeviceGroupMember
Canvys        
Segment Reporting Information [Line Items]        
Net Sales 5,906us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_CanvysMember		 7,591us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_CanvysMember		 11,874us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_CanvysMember		 15,037us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_CanvysMember
Gross Profit 1,653us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_CanvysMember		 2,053us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_CanvysMember		 3,309us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_CanvysMember		 4,025us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_CanvysMember
Healthcare [Member]        
Segment Reporting Information [Line Items]        
Net Sales 1,148us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_HealthcareMember		 1,682us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_HealthcareMember		 2,441us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_HealthcareMember		 3,014us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= rell_HealthcareMember
Gross Profit $ 272us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_HealthcareMember		 $ 447us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_HealthcareMember		 $ 588us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_HealthcareMember		 $ 808us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= rell_HealthcareMember