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Commitments And Contingencies - Additional Information (Detail)
 6 Months Ended
Nov. 30, 2014
Nov. 30, 2013
T&M    
Commitments and Contingencies [Line Items]    
Sales revenue percentage 65.40%elrc_SaleRevenuePercentage
/ us-gaap_ProductOrServiceAxis
= elrc_TestAndMeasurementEquipmentMember		 65.20%elrc_SaleRevenuePercentage
/ us-gaap_ProductOrServiceAxis
= elrc_TestAndMeasurementEquipmentMember
Reseller Agreement [Member]    
Commitments and Contingencies [Line Items]    
Purchase Commitment, Number of Renewals 4elrc_PurchaseCommitmentNumberofRenewals
/ us-gaap_ProductOrServiceAxis
= elrc_ResellerAgreementMember