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Fair Value Measurements (Detail) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2014
May 31, 2014
ASSETS    
Supplemental executive retirement plan $ 3,394elrc_SupplementalExecutiveRetirementPlanAssets $ 3,418elrc_SupplementalExecutiveRetirementPlanAssets
Fair Value, Measurements, Recurring    
ASSETS    
Total assets measured at fair value 3,795us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 3,427us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Fair Value, Measurements, Recurring | Money market funds | Supplemental executive retirement plan    
ASSETS    
Supplemental executive retirement plan 153elrc_SupplementalExecutiveRetirementPlanAssets
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= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 323elrc_SupplementalExecutiveRetirementPlanAssets
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= us-gaap_FairValueMeasurementsRecurringMember
Fair Value, Measurements, Recurring | Mutual funds | Supplemental executive retirement plan    
ASSETS    
Supplemental executive retirement plan 3,241elrc_SupplementalExecutiveRetirementPlanAssets
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= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
/ us-gaap_FairValueByAssetClassAxis
= elrc_MutualFundsMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 3,095elrc_SupplementalExecutiveRetirementPlanAssets
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= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
/ us-gaap_FairValueByAssetClassAxis
= elrc_MutualFundsMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Fair Value, Measurements, Recurring | Foreign exchange forward contracts    
ASSETS    
Foreign exchange forward contracts 401us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
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= us-gaap_FairValueMeasurementsRecurringMember
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring    
ASSETS    
Total assets measured at fair value 3,394us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 3,418us-gaap_AssetsFairValueDisclosureRecurring
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= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Money market funds | Supplemental executive retirement plan    
ASSETS    
Supplemental executive retirement plan 153elrc_SupplementalExecutiveRetirementPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 323elrc_SupplementalExecutiveRetirementPlanAssets
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= us-gaap_FairValueMeasurementsRecurringMember
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Mutual funds | Supplemental executive retirement plan    
ASSETS    
Supplemental executive retirement plan 3,241elrc_SupplementalExecutiveRetirementPlanAssets
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring    
ASSETS    
Total assets measured at fair value 401us-gaap_AssetsFairValueDisclosureRecurring
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= us-gaap_FairValueMeasurementsRecurringMember		 9us-gaap_AssetsFairValueDisclosureRecurring
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Foreign exchange forward contracts    
ASSETS    
Foreign exchange forward contracts $ 401us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 $ 9us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
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