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Reclassification Out of Accumulated Other Comprehensive Income to Statements of Operations (Detail) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2016

^[1],[2]

Oct. 02, 2016

^[2],[3]

Jul. 03, 2016

^[2],[4]

Apr. 03, 2016

^[2],[5]

Dec. 31, 2015

^[6],[7]

Oct. 04, 2015

^[8]

Jul. 05, 2015

^[9]

Apr. 05, 2015

Dec. 31, 2016

Dec. 31, 2015

Dec. 31, 2014

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

Interest income

$ (3,095)

$ (2,892)

$ (1,666)

$ (1,642)

$ (2,017)

$ (1,708)

$ (1,674)

$ (1,816)

$ (9,296)

$ (7,214)

$ (6,259)

Reclassifications, net of tax

945

999

Unrealized Gains (Losses) on Marketable Securities

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

Reclassifications, net of tax

683

704

Amortization of prior service credit

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

Reclassifications, net of tax

321

295

295

Prior service cost arising during period

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

Reclassifications, net of tax

(59)

Retirement Plans Prior Service Credit

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

Reclassifications, net of tax

262

295

295

Accumulated Other Comprehensive Income (Loss)

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

Reclassifications, net of tax

945

999

1,728

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

$ 683

$ 704

$ 1,433

[1]	Restructuring and other includes a $5.4 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[2]	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.
[3]	Restructuring and other includes an $8.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[4]	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 $1.4 million for the increase in the fair value of contingent consideration liability of which $0.8 million related to Universal Robots, and $0.6 million related to AIT, partially offset by $5.1 million of property insurance recovery related to the Japan earthquake.
[5]	Restructuring and other includes a $1.2 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[6]	In the fourth quarter ended December 31, 2015, Teradyne recorded pension and post retirement net actuarial losses of $17.7 million. See Note B: "Accounting Policies" for a discussion of Teradyne's accounting policy.
[7]	Restructuring and other includes a $5.3 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, and a $(0.3) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[8]	Restructuring and other includes a $(1.0) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[9]	Restructuring and other includes a $(1.6) million fair value adjustment to decrease the ZTEC 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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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=66004124&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=66004921&loc=d3e1436-108581

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