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Schedule of Income (Loss) Before Income Taxes (Detail) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2017

^[1],[2]

Oct. 01, 2017

^[3]

Jul. 02, 2017

^[2],[4]

Apr. 02, 2017

^[5]

Dec. 31, 2016

^[6],[7]

Oct. 02, 2016

^[7],[8]

Jul. 03, 2016

^[7],[9]

Apr. 03, 2016

^[7],[10]

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

Income Tax Disclosure [Line Items]

U.S.

$ 76,699

$ (341,018)

$ 56,270

Non-U.S.

447,713

285,958

196,854

Income (loss) before income taxes

$ 98,084

$ 127,437

$ 206,877

$ 92,016

$ 58,884

$ 59,681

$ (230,817)

$ 57,192

$ 524,412

$ (55,060)

$ 253,124

[1]	Restructuring and other includes a $6.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, $1.8 million of employee severance charges, and $1.1 million of charges for impairment of fixed assets.
[2]	Teradyne recorded pension and post retirement net actuarial gains of $2.5 million and $3.8 million for the second and fourth quarter in 2017, respectively. See Note B: "Accounting Policies" for a discussion of Teradyne's accounting policy.
[3]	Restructuring and other includes $5.1 million of property insurance recovery related to the Japan earthquake, a $0.4 million credit related to previously impaired lease termination of a Wireless Test facility in Sunnyvale, CA, and a $0.3 million credit for the decrease in the fair value of the Universal Robots contingent consideration liability, partially offset by $0.8 million of Japan earthquake related expenses and $0.6 million of employee severance charges.
[4]	Restructuring and other includes a $1.5 million charge for a fair value adjustment to increase the Universal Robots acquisition contingent consideration, and $0.8 million of employee severance charges.
[5]	Restructuring and other includes a $1.3 million charge for a lease impairment of a Wireless Test facility in Sunnyvale, CA, a $0.6 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, and $0.6 million of employee severance charges.
[6]	Restructuring and other includes a $5.4 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[7]	Teradyne recorded pension and post retirement net actuarial (gains) losses of $(1.2) million, $(0.7) million, $0.7 million and $(2.0) million for the first, second, third, and fourth quarter in 2016, respectively. See Note B: "Accounting Policies" for a discussion of Teradyne's accounting policy.
[8]	Restructuring and other includes an $8.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[9]	Restructuring and other includes $4.2 million for an impairment of fixed assets, $0.9 million for expenses related to an earthquake in Kumamoto, Japan, and a $1.4 million fair value adjustment to increase contingent consideration liability, of which $0.8 million was related to Universal Robots and $0.6 million was related to AIT, partially offset by $5.1 million of property insurance recovery related to the Japan earthquake.
[10]	Restructuring and other includes a $1.2 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.

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- Definition

Income Tax Disclosure [Line Items]

+ References

No definition available.

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- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

+ 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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- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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