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Quantitative Information Associated With Fair Value Measurement of Level 3 Financial Instrument (Detail) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 3 Months Ended
--- | --- | ---
Oct. 31, 2014 | Apr. 05, 2015
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |
Discount rate | 4.70%us-gaap_FairValueInputsDiscountRate |
Avionics Interface Technologies, LLC |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |
Contingent consideration | 1,800 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember |
Significant Unobservable Inputs (Level 3) | Income Approach Valuation Technique | ZTEC Instruments, Inc. |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |
Contingent consideration |  | 1,600 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember
Significant Unobservable Inputs (Level 3) | Income Approach Valuation Technique | Avionics Interface Technologies, LLC |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |
Contingent consideration |  | 1,750 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember
Revenue Earnout | ZTEC Instruments, Inc. |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |
Target achievement, probability |  | 0.00%ter_FairValueInputsProbabilityOfAchievingTarget / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember / us-gaap_ContingentConsiderationByTypeAxis = ter_RevenueEarnoutMember
Revenue Earnout | Avionics Interface Technologies, LLC |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |
Target achievement, probability |  | 90.00%ter_FairValueInputsProbabilityOfAchievingTarget / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember / us-gaap_ContingentConsiderationByTypeAxis = ter_RevenueEarnoutMember
Customer Orders | ZTEC Instruments, Inc. |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |
Target achievement, probability |  | 40.00%ter_FairValueInputsProbabilityOfAchievingTarget / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember / us-gaap_ContingentConsiderationByTypeAxis = ter_CustomerOrdersMember
Discount rate |  | 5.20%us-gaap_FairValueInputsDiscountRate / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember / us-gaap_ContingentConsiderationByTypeAxis = ter_CustomerOrdersMember
Customer Orders | Avionics Interface Technologies, LLC |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |
Discount rate |  | 4.70%us-gaap_FairValueInputsDiscountRate / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember / us-gaap_ContingentConsiderationByTypeAxis = ter_CustomerOrdersMember

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