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Lists of Intangible Assets and Their Estimated Useful Lives at Acquisition Date (Detail) (USD $) In Thousands, unless otherwise specified | 0 Months Ended
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Oct. 31, 2014 | Oct. 25, 2013
Business Acquisition [Line Items] |  |
Total intangible assets, fair value | $ 9,080 us-gaap_FinitelivedIntangibleAssetsAcquired1 |
Avionics Interface Technologies, LLC |  |
Business Acquisition [Line Items] |  |
Total intangible assets, estimated useful life, years | 4 years 9 months 18 days |
ZTEC Instruments, Inc. |  |
Business Acquisition [Line Items] |  |
Total intangible assets, fair value |  | 4,870 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember
Total intangible assets, estimated useful life, years |  | 5 years 3 months 18 days
Developed technology | Avionics Interface Technologies, LLC |  |
Business Acquisition [Line Items] |  |
Total intangible assets, fair value | 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 |
Developed technology | ZTEC Instruments, Inc. |  |
Business Acquisition [Line Items] |  |
Total intangible assets, fair value |  | 3,500 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember
Total intangible assets, estimated useful life, years |  | 5 years
Customer Relationships | Avionics Interface Technologies, LLC |  |
Business Acquisition [Line Items] |  |
Total intangible assets, fair value | 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 |
Customer Relationships | ZTEC Instruments, Inc. |  |
Business Acquisition [Line Items] |  |
Total intangible assets, fair value |  | 1,370 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Total intangible assets, estimated useful life, years |  | 6 years
Trade Names | Avionics Interface Technologies, LLC |  |
Business Acquisition [Line Items] |  |
Total intangible assets, fair value | 380 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |
Total intangible assets, estimated useful life, years | 5 years |
Noncompete Agreements | Avionics Interface Technologies, LLC |  |
Business Acquisition [Line Items] |  |
Total intangible assets, fair value | 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 backlog | Avionics Interface Technologies, LLC |  |
Business Acquisition [Line Items] |  |
Total intangible assets, fair value | $ 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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- 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
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