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Schedule of Segment Information (Detail) (USD $)
In Thousands, unless otherwise specified

3 Months Ended

Apr. 05, 2015

Mar. 30, 2014

Segment Reporting Information [Line Items]

Revenues

$ 342,401us-gaap_Revenues

$ 321,010us-gaap_Revenues

Income (loss) before taxes

42,438us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

^[1],[2]

(1,873)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

^[1],[2]

Semiconductor Test

Segment Reporting Information [Line Items]

Revenues

270,917us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember

261,737us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember

Income (loss) before taxes

43,125us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember

^[1],[2]

34,600us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SemiconductorTestMember

^[1],[2]

Wireless Test

Segment Reporting Information [Line Items]

Revenues

34,048us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember

21,210us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember

Income (loss) before taxes

(10,441)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember

^[1],[2]

(25,085)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= ter_WirelessTestMember

^[1],[2]

System Test

Segment Reporting Information [Line Items]

Revenues

37,436us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember

38,063us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember

Income (loss) before taxes

1,005us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember

^[1],[2]

448us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= ter_SystemsTestGroupMember

^[1],[2]

Corporate And Eliminations

Segment Reporting Information [Line Items]

Income (loss) before taxes

$ 8,749us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= ter_CorporateAndEliminationsMember

^[1],[2]

$ (11,836)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= ter_CorporateAndEliminationsMember

^[1],[2]

[1]	Interest income, interest expense, and other (income) expense, net are included in Corporate and Eliminations.
[2]	Included in the income (loss) before income taxes for each of the segments are charges related to inventory and other.

X

- Definition

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h)(1)(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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