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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
	Oct. 31, 2014	Oct. 25, 2013
Business Acquisition [Line Items]
Total intangible assets, fair value	$ 9,080us-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		4,870us-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	2,580us-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		3,500us-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	5,630us-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		1,370us-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	380us-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	320us-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	$ 170us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember
Total intangible assets, estimated useful life, years	3 months 18 days

X

- 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

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+ References

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