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v3.20.4

Schedule of Segment Reporting Information by Segment Charges (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | [1],[2] | Sep. 30, 2020 | Sep. 27, 2020 | [2],[3] | Jun. 30, 2020 | Jun. 28, 2020 | [2],[4] | Mar. 31, 2020 | Mar. 29, 2020 | [5] | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  | $ 500 |  | $ 3,100 |  | $ 1,400 |  | $ 200 |  | $ 500 |  | $ 500 |  | $ 1,300 |  |  |  |
Restructuring and other-employee severance | $ (15,117) |  | $ (27,701) |  | $ 37,222 |  | $ (7,606) | (2,088) | [6],[7],[8] | (6,500) | [9] | (10,404) | [10] | 5,112 | [11] | $ (13,202) | $ (13,880) | $ 15,232
Contingent consideration adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (23,271) | (19,257) | 987
Investment impairment |  |  |  |  |  |  |  | 15,000 |  |  |  |  |  |  |  |  | 15,000 |
Universal Robots (UR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration adjustment |  | $ 27,200 |  | $ 29,900 |  | $ 10,000 |  |  |  | $ 7,800 |  | $ 11,700 |  | $ 3,000 |  |  | 3,800 |
Mobile Industrial Robots (MiR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration adjustment |  |  |  |  |  |  |  | $ 5,800 |  |  |  |  |  |  |  |  |  |
Semiconductor Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500 | 2,500 |
Cost of revenues-inventory charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,277 | 8,429
Restructuring and other-employee severance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,013 |  |
Contingent consideration adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,500 |  |
Contract termination settlement fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000 |  |
Semiconductor Test | Severance And Benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and other-employee severance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,731 | 6,822
Industrial Automation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 985 | 741 | 1,163
Cost of revenues-inventory charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 887 | 2,000 | 1,175
Restructuring and other-employee severance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,584 | 796 |
Industrial Automation | Restructuring and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,728 | 1,765 |
Industrial Automation | Severance And Benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and other-employee severance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,422
System Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenues-inventory charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 834 | 508 | 680
Wireless Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenues-inventory charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,800 | 4,005 | 2,565
Corporate And Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selling and administrative – equity modification charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 766 | 2,108 |
Corporate And Eliminations | Restructuring and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000 |
Corporate And Eliminations | Universal Robots (UR) | Restructuring and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (16,679)
Corporate And Eliminations | Mobile Industrial Robots (MiR) | Restructuring and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and other-lease impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,546) | (22,199) | $ 17,666
Contingent consideration adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (19,724) | $ 2,976 |
[1] | Restructuring and other includes a $15.3 million gain for the decrease in the fair value adjustment to the AutoGuide acquisition contingent consideration liability, and a $0.9 million gain for the decrease in acquisition related compensation liability, partially offset by $1.1 million of employee severance charges primarily in Industrial Automation.
[2] | Teradyne recorded pension and post retirement net actuarial (gains) losses of $(0.1) million, $2.7 million, $7.7 million for the second, third and fourth quarter in 2020, respectively. See Note B: “Accounting Policies” for a discussion of Teradyne’s accounting policy.
[3] | Restructuring and other includes a $27.2 million gain for the decrease in the fair value of AutoGuide contingent consideration liability, and a $1.1 million gain for the decrease in acquisition related compensation liability, partially offset by $0.5 million recorded for employee severance charges primarily in Industrial Automation.
[4] | Restructuring and other includes a $29.9 million charge for the increase in the fair value of the AutoGuide contingent consideration liability, a $4.0 million contract termination settlement charge, $3.1 million of acquisition related compensation and expense and $0.8 million of other expenses, partially offset by a $0.6 million gain for the decrease in the fair value of MiR contingent consideration liability.
[5] | Restructuring and other includes a $10.0 million gain for the decrease in the fair value of the AutoGuide and MiR contingent consideration liabilities, partially offset by $1.4 million of acquisition related compensation and expenses and $0.7 million of severance charges related to headcount reductions primarily in Industrial Automation and Semiconductor Test.
[6] | Other (income) expense, net includes a $15.0 million charge for the impairment of the investment in RealWear.
[7] | Restructuring and other includes a $5.8 million gain for the decrease in the fair value adjustment to the MiR acquisition contingent consideration, partially offset by a $3.0 million fair value adjustment to increase the AutoGuide acquisition contingent consideration, $0.5 million of employee severance charges and $0.2 million of acquisition related expenses and compensation.
[8] | Teradyne recorded pension and post retirement net actuarial losses of $7.7 million for the fourth quarter in 2019. See Note B: “Accounting Policies” for a discussion of Teradyne’s accounting policy.
[9] | Restructuring and other includes a $7.8 million gain for the decrease in the fair value of MiR contingent consideration liability, partially offset by $0.8 million of employee severance charges and $0.5 million of acquisition related expenses and compensation.
[10] | Restructuring and other includes a $11.7 million gain for the decrease in the fair value of the MiR contingent consideration liability, partially offset by $0.8 million of employee severance charges and $0.5 million of acquisition related expenses and compensation.
[11] | Restructuring and other includes a $3.0 million fair value adjustment to increase the MiR acquisition contingent consideration, $1.3 million of acquisition related expenses and compensation and $0.8 million of employee severance charges.

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