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Reclassifications Out of Accumulated Other Comprehensive Income to Statements of Operations (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

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Interest income

$ (6,476)

$ (4,517)

$ (3,292)

$ (3,520)

$ (3,095)

$ (2,892)

$ (1,666)

$ (1,642)

$ (17,805)

$ (9,296)

$ (7,214)

Reclassifications, net of tax

713

1,004

Unrealized Gains (Losses) on Marketable Securities

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Reclassifications, net of tax

441

683

Amortization of prior service credit

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Reclassifications, net of tax

272

321

295

Accumulated Other Comprehensive Income (Loss)

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Reclassifications, net of tax

713

1,004

999

Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Marketable Securities

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Interest income

$ 441

$ 683

$ 704

[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.

X

- Definition

Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

+ 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 210.5-03.7(b))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

Amount after tax of reclassification adjustments of other comprehensive income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581

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