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Components of Intangible Assets and Their Estimated Useful Lives at Acquisition Date (Detail) (Avionics Interface Technologies, LLC, USD $) In Thousands, unless otherwise specified | 0 Months Ended
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Oct. 31, 2014
Business Acquisition [Line Items] |
Total intangible assets, estimated useful life, years | $ 9,080 us-gaap_FinitelivedIntangibleAssetsAcquired1
Total intangible assets, estimated useful life, years | 4 years 9 months 18 days
Customer Relationships |
Business Acquisition [Line Items] |
Total intangible assets, estimated useful life, years | 5,630 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Total intangible assets, estimated useful life, years | 5 years
Developed technology |
Business Acquisition [Line Items] |
Total intangible assets, estimated useful life, years | 2,580 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember
Total intangible assets, estimated useful life, years | 4 years 9 months 18 days
Trade Names |
Business Acquisition [Line Items] |
Total intangible assets, estimated useful life, years | 380 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Total intangible assets, estimated useful life, years | 5 years
Non-compete agreement |
Business Acquisition [Line Items] |
Total intangible assets, estimated useful life, years | 320 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Total intangible assets, estimated useful life, years | 4 years
Customer order backlog |
Business Acquisition [Line Items] |
Total intangible assets, estimated useful life, years | $ 170 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember
Total intangible assets, estimated useful life, years | 3 months 18 days

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination. + References No definition available. + Details
Name: | us-gaap_FinitelivedIntangibleAssetsAcquired1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration