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

3 Months Ended

12 Months Ended

Dec. 31, 2018

^[1],[2]

Sep. 30, 2018

^[2],[3]

Jul. 01, 2018

^[2],[4]

Apr. 01, 2018

^[5]

Dec. 31, 2017

^[6],[7]

Oct. 01, 2017

^[7],[8]

Jul. 02, 2017

^[7],[9]

Apr. 02, 2017

^[10]

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Income Tax Disclosure [Line Items]

U.S.

$ 189,691

$ 76,699

$ (341,018)

Non-U.S.

278,110

447,713

285,958

Income (loss) before income taxes

$ 111,128

$ 140,841

$ 120,012

$ 95,820

$ 98,084

$ 127,437

$ 206,877

$ 92,016

$ 467,801

$ 524,412

$ (55,060)

[1]	Restructuring and other includes a $17.7 million fair value adjustment to increase the MiR acquisition contingent consideration, $0.8 million of employee severance charges, and $0.5 million acquisition related expenses and compensation, partially offset by a $7.4 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability.
[2]	Teradyne recorded pension and post retirement net actuarial (gains) losses of $(0.1) million, $0.3 million and $(3.5) million for the second, third and fourth quarter in 2018, respectively. See Note B: “Accounting Policies” for a discussion of Teradyne’s accounting policy.
[3]	Restructuring and other includes $1.7 million of employee severance charges, $0.8 million of acquisition related expenses and compensation, partially offset by a $0.8 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability.
[4]	Restructuring and other includes a $5.0 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability, partially offset by $3.9 million of employee severance charges and $0.8 million of acquisition related expenses and compensation.
[5]	Restructuring and other includes a $3.5 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability, partially offset by $2.5 million of acquisition related expenses and compensation and $2.4 million of employee severance charges.
[6]	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.
[7]	Teradyne recorded pension and post retirement net actuarial gains of $2.8 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.
[8]	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.
[9]	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.
[10]	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.

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