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Commitments And Contingencies - Additional Information (Detail)
 9 Months Ended
Feb. 28, 2015
Feb. 28, 2014
T&M    
Commitments and Contingencies [Line Items]    
Sales revenue percentage 66.80%elrc_SaleRevenuePercentage
/ us-gaap_ProductOrServiceAxis
= elrc_TestAndMeasurementEquipmentMember		 63.10%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