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Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Detail) - USD ($)
$ in Thousands

3 Months Ended

Apr. 02, 2017

Apr. 03, 2016

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Balance at beginning of period

$ 38,332

$ 37,436

Payments

^[1]

(1,050)

(15,000)

Fair value adjustment

^[2]

634

1,173

Ending Balance

$ 37,916

$ 23,609

[1]	In the three months ended April 2, 2017, Teradyne paid $1.1 million of the AIT contingent consideration. In the three months ended April 3, 2016 based on Universal Robots' calendar year 2015 EBITDA results, Teradyne paid $15.0 million or 100% of the eligible EBITDA contingent consideration amount.
[2]	In the three months ended April 2, 2017 and April 3, 2016, the fair value of contingent consideration for the earn-out in connection with the acquisition of Universal Robots was increased by $0.6 million and $1.2 million, respectively, primarily due to a decrease in the discount rate.

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Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-Name Accounting Standards Codification
-Topic 820
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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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