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Retirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Defined Benefit Pension and Postretirement Benefit Plan Assets and Obligations | The December 31 balances of these defined benefit pension plans assets and obligations are shown below:
|  | 2020 |  |  | 2019 |
|  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |
|  | (in thousands) |
Assets and Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in benefit obligation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Projected benefit obligation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning of year |  | $ | 203,791 |  |  | $ | 43,952 |  |  | $ | 178,237 |  |  | $ | 39,146 |
Service cost |  |  | 1,773 |  |  |  | 907 |  |  |  | 1,608 |  |  |  | 751 |
Interest cost |  |  | 5,770 |  |  |  | 516 |  |  |  | 7,189 |  |  |  | 691 |
Actuarial loss |  |  | 24,671 |  |  |  | 2,951 |  |  |  | 24,447 |  |  |  | 4,520 |
Benefits paid |  |  | (9,844 | ) |  |  | (1,299 | ) |  |  | (7,690 | ) |  |  | (836 | )
Retiree annuity purchase |  |  | (24,379 | ) |  |  | — |  |  |  | — |  |  |  | — |
Liability loss due to settlement |  |  | 451 |  |  |  | — |  |  |  | — |  |  |  | — |
Non-U.S. currency movement |  |  | — |  |  |  | 3,961 |  |  |  | — |  |  |  | (320 | )
End of year |  |  | 202,233 |  |  |  | 50,988 |  |  |  | 203,791 |  |  |  | 43,952 |
Change in plan assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning of year |  |  | 166,932 |  |  |  | 1,586 |  |  |  | 144,301 |  |  |  | 1,400 |
Actual return on plan assets |  |  | 23,048 |  |  |  | 67 |  |  |  | 27,516 |  |  |  | 64 |
Company contributions |  |  | 3,098 |  |  |  | 1,079 |  |  |  | 2,805 |  |  |  | 923 |
Benefits paid |  |  | (9,844 | ) |  |  | (988 | ) |  |  | (7,690 | ) |  |  | (836 | )
Retiree annuity purchase |  |  | (24,379 | ) |  |  | — |  |  |  | — |  |  |  | — |
Non-U.S. currency movement |  |  | — |  |  |  | 112 |  |  |  | — |  |  |  | 35 |
End of year |  |  | 158,855 |  |  |  | 1,856 |  |  |  | 166,932 |  |  |  | 1,586 |
Funded status |  | $ | (43,378 | ) |  | $ | (49,132 | ) |  | $ | (36,859 | ) |  | $ | (42,366 | )
Amounts Recorded within Statement of Financial Position | The following table provides amounts recorded within the account line items of the statements of financial position as of December 31:
|  | 2020 |  |  | 2019 |
|  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |
|  | (in thousands) |
Retirement plans assets |  | $ | 17,468 |  |  | $ | — |  |  | $ | 18,457 |  |  | $ | — |
Accrued employees’ compensation and withholdings |  |  | (3,273 | ) |  |  | (1,019 | ) |  |  | (2,826 | ) |  |  | (922 | )
Retirement plans liabilities |  |  | (57,573 | ) |  |  | (48,113 | ) |  |  | (52,490 | ) |  |  | (41,444 | )
Funded status |  | $ | (43,378 | ) |  | $ | (49,132 | ) |  | $ | (36,859 | ) |  | $ | (42,366 | )
Amounts Recognized in Accumulated Other Comprehensive Income | The following table provides amounts recognized in accumulated other comprehensive income as of December 31:
|  | 2020 |  |  | 2019 |
|  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |
|  | (in thousands) |
Deferred taxes related to prior service cost recognized in other comprehensive income |  | $ | 560 |  |  | $ | — |  |  | $ | 560 |  |  | $ | — |
Pension Plans with Accumulated Benefit Obligation and Projected Benefit Obligation in Excess of Plan Assets | Information for pension plans with an accumulated benefit obligation in excess of plan assets as of Decemb e r 31:
|  | 2020 |  |  | 2019 |
|  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |
|  | (in millions) |
Projected benefit obligation |  | $ | 60.8 |  |  | $ | 51.0 |  |  | $ | 55.3 |  |  | $ | 44.0 |
Accumulated benefit obligation |  |  | 58.5 |  |  |  | 46.5 |  |  |  | 53.2 |  |  |  | 39.9 |
Fair value of plan assets |  |  | — |  |  |  | 1.9 |  |  |  | — |  |  |  | 1.6 |
Net Periodic Pension and Postretirement Benefit Costs | For the years ended December 31, 2020, 2019, and 2018, Teradyne’s net periodic pension cost (income) was comprised of the following:
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |
|  | (in thousands) |
Components of Net Periodic Pension Cost (Income): |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 1,773 |  |  | $ | 907 |  |  | $ | 1,608 |  |  | $ | 751 |  |  | $ | 2,196 |  |  | $ | 786 |
Interest cost |  |  | 5,770 |  |  |  | 516 |  |  |  | 7,189 |  |  |  | 691 |  |  |  | 8,940 |  |  |  | 687 |
Expected return on plan assets |  |  | (4,840 | ) |  |  | (65 | ) |  |  | (6,042 | ) |  |  | (29 | ) |  |  | (9,049 | ) |  |  | (19 | )
Amortization of prior service cost |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 58 |  |  |  | — |
Net actuarial loss (gain) |  |  | 6,463 |  |  |  | 2,949 |  |  |  | 2,973 |  |  |  | 4,485 |  |  |  | (4,429 | ) |  |  | 743 |
Settlement loss |  |  | 451 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 345 |  |  |  | — |
Total net periodic pension cost (income) |  | $ | 9,617 |  |  | $ | 4,307 |  |  | $ | 5,728 |  |  | $ | 5,898 |  |  | $ | (1,939 | ) |  | $ | 2,197 |
Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reversal of amortization items: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (58 | ) |  |  | — |
Total recognized in other comprehensive income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (58 | ) |  |  | — |
Total recognized in net periodic pension cost (income) and other comprehensive income |  | $ | 9,617 |  |  | $ | 4,307 |  |  | $ | 5,728 |  |  | $ | 5,898 |  |  | $ | (1,997 | ) |  | $ | 2,197 |
Weighted Average Assumptions to Determine Net Periodic Cost and Benefit Obligation | Weighted Average Assumptions to Determine Net Periodic Pension Cost at January 1:
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |
Discount rate |  |  | 2.8 | % |  |  | 1.1 | % |  |  | 4.1 | % |  |  | 1.8 | % |  |  | 3.4 | % |  |  | 1.8 | %
Expected return on plan assets |  |  | 3.0 |  |  |  | 3.8 |  |  |  | 4.3 |  |  |  | 2.0 |  |  |  | 4.3 |  |  |  | 1.5 |
Salary progression rate |  |  | 2.6 |  |  |  | 2.5 |  |  |  | 2.3 |  |  |  | 2.5 |  |  |  | 2.3 |  |  |  | 2.7 |
Weighted Average Assumptions to Determine Pension Obligations at December 31:
|  | 2020 |  |  | 2019 |
|  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |
Discount rate |  |  | 2.2 | % |  |  | 0.7 | % |  |  | 3.0 | % |  |  | 1.1 | %
Salary progression rate |  |  | 2.4 |  |  |  | 2.3 |  |  |  | 2.6 |  |  |  | 2.5 |
Weighted Average Pension Asset Allocations by Category | The following table provides weighted average pension asset allocation by asset category at December 31, 2020 and 2019:
|  | 2020 |  |  | 2019 |
|  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |
Fixed income securities |  |  | 94.0 | % |  |  | — | % |  |  | 94.0 | % |  |  | — | %
Equity securities |  |  | 5.0 |  |  |  | — |  |  |  | 5.0 |  |  |  | — |
Other |  |  | 1.0 |  |  |  | 100.0 |  |  |  | 1.0 |  |  |  | 100.0 |
|  |  | 100.0 | % |  |  | 100.0 | % |  |  | 100.0 | % |  |  | 100.0 | %
Target Asset Allocation and Index for Each Asset Category | The target asset allocation and the index for each asset category for the U.S. Plan, per the investment policy, are as follows:
Asset Category: |  | Policy Index: |  | Target Allocation |
U.S. corporate fixed income |  | Bloomberg Barclays U.S. Corporate A or Better Index |  |  | 75 | %
Global equity |  | MSCI World Minimum Volatility Index |  |  | 5 |
U.S. government fixed income |  | Bloomberg Barclays U.S. Long Government Bond Index |  |  | 14 |
High yield fixed income |  | Bloomberg Barclays U.S. Corporate High Yield 2% Issuer Cap Index |  |  | 5 |
Cash |  | Citigroup Three Month U.S. Treasury Bill Index |  |  | 1 |
Changes in Fair Value of Pension Assets | The fair value of pension plan assets by asset category and by level at December 31, 2020 and December 31, 2019 were as follows:
|  | December 31, 2020 |
|  | United States |  |  | Foreign |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
|  | (in thousands) |
Fixed income securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | — |  |  | $ | 127,098 |  |  | $ | — |  |  | $ | 127,098 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
U.S. government securities |  |  | — |  |  |  | 22,250 |  |  |  | — |  |  |  | 22,250 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Global equity |  |  | — |  |  |  | 7,925 |  |  |  | — |  |  |  | 7,925 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Other |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,856 |  |  |  | — |  |  |  | 1,856 |
Cash and cash equivalents |  |  | 1,582 |  |  |  | — |  |  |  | — |  |  |  | 1,582 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 1,582 |  |  | $ | 157,273 |  |  | $ | — |  |  | $ | 158,855 |  |  | $ | — |  |  | $ | 1,856 |  |  | $ | — |  |  | $ | 1,856 |
|  | December 31, 2019 |
|  | United States |  |  | Foreign |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
|  | (in thousands) |
Fixed income securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | — |  |  | $ | 133,792 |  |  | $ | — |  |  | $ | 133,792 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
U.S. government securities |  |  | — |  |  |  | 23,186 |  |  |  | — |  |  |  | 23,186 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Global equity |  |  | — |  |  |  | 8,344 |  |  |  | — |  |  |  | 8,344 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Other |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,586 |  |  |  | — |  |  |  | 1,586 |
Cash and cash equivalents |  |  | 1,610 |  |  |  | — |  |  |  | — |  |  |  | 1,610 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 1,610 |  |  | $ | 165,322 |  |  | $ | — |  |  | $ | 166,932 |  |  | $ | — |  |  | $ | 1,586 |  |  | $ | — |  |  | $ | 1,586 |
Expected Future Benefit Payments | Future benefit payments are expected to be paid as follows:
|  | United States |  |  | Foreign |
|  | (in thousands) |
2021 |  | $ | 8,902 |  |  | $ | 1,058 |
2022 |  |  | 8,782 |  |  |  | 1,063 |
2023 |  |  | 9,189 |  |  |  | 1,313 |
2024 |  |  | 9,815 |  |  |  | 1,192 |
2025 |  |  | 10,374 |  |  |  | 1,140 |
2026-2030 |  |  | 54,145 |  |  |  | 7,053 |
Postretirement Benefit Plans |
Defined Benefit Pension and Postretirement Benefit Plan Assets and Obligations | The December 31 balances of the postretirement assets and obligations are shown below:
|  | 2020 |  |  | 2019 |
|  | (in thousands) |
Assets and Obligations |  |  |  |  |  |  |  |
Change in benefit obligation: |  |  |  |  |  |  |  |
Projected benefit obligation: |  |  |  |  |  |  |  |
Beginning of year |  | $ | 9,003 |  |  | $ | 9,256 |
Service cost |  |  | 57 |  |  |  | 41 |
Interest cost |  |  | 240 |  |  |  | 347 |
Actuarial loss |  |  | 421 |  |  |  | 717 |
Benefits paid |  |  | (1,205 | ) |  |  | (1,358 | )
End of year |  |  | 8,515 |  |  |  | 9,003 |
Change in plan assets: |  |  |  |  |  |  |  |
Fair value of plan assets: |  |  |  |  |  |  |  |
Beginning of year |  |  | — |  |  |  | — |
Company contributions |  |  | 1,205 |  |  |  | 1,358 |
Benefits paid |  |  | (1,205 | ) |  |  | (1,358 | )
End of year |  |  | — |  |  |  | — |
Funded status |  | $ | (8,515 | ) |  | $ | (9,003 | )
Amounts Recorded within Statement of Financial Position | The following table provides amounts recorded within the account line items of financial position as of December 31:
|  | 2020 |  |  | 2019 |
|  | (in thousands) |
Accrued employees’ compensation and withholdings |  | $ | (1,161 | ) |  | $ | (1,231 | )
Retirement plans liability |  |  | (7,354 | ) |  |  | (7,772 | )
Funded status |  | $ | (8,515 | ) |  | $ | (9,003 | )
Amounts Recognized in Accumulated Other Comprehensive Income | The following table provides amounts recognized in accumulated other comprehensive income as of December 31:
|  | 2020 |  |  | 2019 |
|  | (in thousands) |
Prior service credit, before tax |  | $ | (49 | ) |  | $ | (58 | )
Deferred taxes |  |  | (1,686 | ) |  |  | (1,684 | )
Total recognized in other comprehensive income, net of tax |  | $ | (1,735 | ) |  | $ | (1,742 | )
Net Periodic Pension and Postretirement Benefit Costs | For the years ended December 31, 2020, 2019, and 2018, Teradyne’s net periodic postretirement benefit cost (income) was comprised of the following:
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  | (in thousands) |
Components of Net Periodic Postretirement Benefit Cost (income): |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 57 |  |  | $ | 41 |  |  | $ | 39 |
Interest cost |  |  | 240 |  |  |  | 347 |  |  |  | 196 |
Amortization of prior service credit |  |  | (9 | ) |  |  | (191 | ) |  |  | (373 | )
Net actuarial loss |  |  | 421 |  |  |  | 717 |  |  |  | 25 |
Special termination benefits |  |  | — |  |  |  | — |  |  |  | 3,708 |
Total net periodic postretirement benefit cost |  |  | 709 |  |  |  | 914 |  |  |  | 3,595 |
Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income: |  |  |  |  |  |  |  |  |  |  |  |
Reversal of amortization items: |  |  |  |  |  |  |  |  |  |  |  |
Prior service credit |  |  | 9 |  |  |  | 191 |  |  |  | 373 |
Total recognized in other comprehensive income |  |  | 9 |  |  |  | 191 |  |  |  | 373 |
Total recognized in net periodic postretirement cost and other comprehensive income |  | $ | 718 |  |  | $ | 1,105 |  |  | $ | 3,968 |
Weighted Average Assumptions to Determine Net Periodic Cost and Benefit Obligation | Weighted Average Assumptions to Determine Net Periodic Postretirement Benefit Income as of January 1:
|  | 2020 |  |  | 2019 |  |  | 2018 |
Discount rate |  |  | 3.0 | % |  |  | 4.0 | % |  |  | 3.4 | %
Initial health care cost trend rate |  |  | 7.1 |  |  |  | 7.5 |  |  |  | 7.9 |
Ultimate health care cost trend rate |  |  | 4.5 |  |  |  | 4.5 |  |  |  | 4.5 |
Year in which ultimate health care cost trend rate is reached |  |  | 2026 |  |  |  | 2026 |  |  |  | 2026 |
Weighted Average Assumptions to Determine Postretirement Benefit Obligation as of December 31:
|  | 2020 |  |  | 2019 |  |  | 2018 |
Discount rate |  |  | 2.2 | % |  |  | 3.0 | % |  |  | 4.0 | %
Initial medical trend |  |  | 7.3 |  |  |  | 7.1 |  |  |  | 7.5 |
Ultimate health care trend |  |  | 4.5 |  |  |  | 4.5 |  |  |  | 4.5 |
Medical cost trend rate decrease to ultimate rate in year |  |  | 2029 |  |  |  | 2026 |  |  |  | 2026 |
Expected Future Benefit Payments | Future benefit payments are expected to be paid as follows:
|  | Benefit Payments |
|  | (in thousands) |
2021 |  | $ | 1,161 |
2022 |  |  | 961 |
2023 |  |  | 786 |
2024 |  |  | 646 |
2025 |  |  | 533 |
2026-2030 |  |  | 1,601 |

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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the change in the benefit obligation of pension plans and/or other employee benefit plans from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the effect of fair value measurements using significant unobservable inputs (Level 3) on changes in plan assets of pension plans and/or other employee benefit plans for the period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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