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Retirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items] |
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:
|  | 2024 |  |  | 2023 |
|  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |
|  | (in thousands) |
Assets and Obligations |  |  |  |  |  |  |  |  |  |  |  |
Change in benefit obligation: |  |  |  |  |  |  |  |  |  |  |  |
Projected benefit obligation: |  |  |  |  |  |  |  |  |  |  |  |
Beginning of year |  | $ | 144,187 |  |  | $ | 33,984 |  |  | $ | 143,814 |  |  | $ | 29,935 |
Service cost |  |  | 881 |  |  |  | 446 |  |  |  | 1,063 |  |  |  | 446 |
Interest cost |  |  | 6,292 |  |  |  | 953 |  |  |  | 6,888 |  |  |  | 1,057 |
Actuarial (gain) loss |  |  | (6,014 | ) |  |  | (1,972 | ) |  |  | 3,229 |  |  |  | 2,738 |
Benefits paid |  |  | (11,658 | ) |  |  | (955 | ) |  |  | (10,807 | ) |  |  | (947 | )
Retiree annuity purchase |  |  | (23,386 | ) |  |  | — |  |  |  | — |  |  |  | — |
Liability (gain) loss due to settlement |  |  | 394 |  |  |  | (195 | ) |  |  | — |  |  |  | (254 | )
Non-U.S. currency movement |  |  | — |  |  |  | (1,988 | ) |  |  | — |  |  |  | 1,009 |
End of year |  |  | 110,696 |  |  |  | 30,273 |  |  |  | 144,187 |  |  |  | 33,984 |
Change in plan assets: |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets: |  |  |  |  |  |  |  |  |  |  |  |
Beginning of year |  |  | 112,617 |  |  |  | 1,929 |  |  |  | 111,760 |  |  |  | 2,087 |
Actual return on plan assets |  |  | 779 |  |  |  | 77 |  |  |  | 8,613 |  |  |  | 43 |
Company contributions |  |  | 3,065 |  |  |  | 1,024 |  |  |  | 3,051 |  |  |  | 1,028 |
Benefits paid |  |  | (11,658 | ) |  |  | (955 | ) |  |  | (10,807 | ) |  |  | (947 | )
Retiree annuity purchase |  |  | (23,386 | ) |  |  | — |  |  |  | — |  |  |  | — |
Settlements gain |  |  | — |  |  |  | (195 | ) |  |  | — |  |  |  | (254 | )
Non-U.S. currency movement |  |  | — |  |  |  | 108 |  |  |  | — |  |  |  | (28 | )
End of year |  |  | 81,417 |  |  |  | 1,988 |  |  |  | 112,617 |  |  |  | 1,929 |
Funded status |  | $ | (29,279 | ) |  | $ | (28,285 | ) |  | $ | (31,570 | ) |  | $ | (32,055 | )
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:
|  | 2024 |  |  | 2023 |
|  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |
|  | (in thousands) |
Retirement plans assets |  | $ | 11,994 |  |  | $ | — |  |  | $ | 11,504 |  |  | $ | — |
Accrued employees’ compensation and withholdings |  |  | (3,263 | ) |  |  | (969 | ) |  |  | (3,110 | ) |  |  | (1,255 | )
Retirement plans liabilities |  |  | (38,010 | ) |  |  | (27,316 | ) |  |  | (39,964 | ) |  |  | (30,800 | )
Funded status |  | $ | (29,279 | ) |  | $ | (28,285 | ) |  | $ | (31,570 | ) |  | $ | (32,055 | )
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 December 31:
|  | 2024 |  |  | 2023 |
|  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |
|  | (in millions) |
Projected benefit obligation |  | $ | 41.3 |  |  | $ | 30.3 |  |  | $ | 43.1 |  |  | $ | 34.0 |
Accumulated benefit obligation |  |  | 41.1 |  |  |  | 29.1 |  |  |  | 42.6 |  |  |  | 32.5 |
Fair value of plan assets |  |  | — |  |  |  | 2.0 |  |  |  | — |  |  |  | 1.9 |
Net Periodic Pension and Postretirement Benefit Cost (Income) | For the years ended December 31, 2024, 2023, and 2022, Teradyne’s net periodic pension cost (income) was comprised of the following:
|  | 2024 |  |  | 2023 |  |  | 2022 |
|  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |
|  | (in thousands) |
Components of Net Periodic Pension Cost (Income): |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 881 |  |  | $ | 446 |  |  | $ | 1,063 |  |  | $ | 446 |  |  | $ | 1,588 |  |  | $ | 784 |
Interest cost |  |  | 6,292 |  |  |  | 953 |  |  |  | 6,888 |  |  |  | 1,057 |  |  |  | 4,886 |  |  |  | 482 |
Expected return on plan assets |  |  | (4,865 | ) |  |  | (77 | ) |  |  | (5,194 | ) |  |  | (45 | ) |  |  | (2,927 | ) |  |  | (75 | )
Net actuarial (gain) loss |  |  | (1,929 | ) |  |  | (1,948 | ) |  |  | 18 |  |  |  | 2,735 |  |  |  | (11,170 | ) |  |  | (13,259 | )
Settlement (gain) loss |  |  | 394 |  |  |  | (24 | ) |  |  | (209 | ) |  |  | 5 |  |  |  | — |  |  |  | — |
Total net periodic pension cost (income) |  | $ | 773 |  |  | $ | (650 | ) |  | $ | 2,566 |  |  | $ | 4,198 |  |  | $ | (7,623 | ) |  | $ | (12,068 | )
Weighted Average Assumptions to Determine Net Periodic Cost and Benefit Obligation | Weighted Average Assumptions to Determine Net Periodic Pension Cost at January 1:
|  | 2024 |  |  | 2023 |  |  | 2022 |
|  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |
Discount rate |  |  | 4.7 | % |  |  | 3.0 | % |  |  | 3.5 | % |  |  | 3.5 | % |  |  | 2.5 | % |  |  | 1.1 | %
Expected return on plan assets |  |  | 4.7 |  |  |  | 2.5 |  |  |  | 4.8 |  |  |  | 1.8 |  |  |  | 2.0 |  |  |  | 4.0 |
Salary progression rate |  |  | 2.5 |  |  |  | 2.4 |  |  |  | 2.4 |  |  |  | 2.1 |  |  |  | 2.4 |  |  |  | 2.2 |
Weighted Average Assumptions to Determine Pension Obligations at December 31:
|  | 2024 |  |  | 2023 |
|  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |
Discount rate |  |  | 5.4 | % |  |  | 3.3 | % |  |  | 4.7 | % |  |  | 3.0 | %
Salary progression rate |  |  | 2.5 |  |  |  | 2.4 |  |  |  | 2.5 |  |  |  | 2.4 |
Weighted Average Pension Asset Allocations by Category | The following table provides weighted average pension asset allocation by asset category at December 31, 2024 and 2023:
|  | 2024 |  |  | 2023 |
|  | 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 U.S. Corporate A or Better Index, 20+ Year Index |  |  | 66 | %
U.S. corporate fixed income |  | Bloomberg U.S. Intermediate Corporate ex Baa Index |  |  | 9 |
U.S. government fixed income |  | Bloomberg U.S. 3 - 10 year Treasury Bond Index |  |  | 12 |
U.S. government fixed income |  | Bloomberg U.S. Government Bond Index |  |  | 2 |
Global equity |  | MSCI World Index |  |  | 5 |
High yield fixed income |  | ICE BofA BB-B U.S. High Yield Constrained Index |  |  | 5 |
Cash |  | ICE BofA 3-Month 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, 2024 and December 31, 2023 were as follows:
|  | December 31, 2024 |
|  | 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 |  | $ | — |  |  | $ | 65,160 |  |  | $ | — |  |  | $ | 65,160 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
U.S. government securities |  |  | — |  |  |  | 11,414 |  |  |  | — |  |  |  | 11,414 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Global equity |  |  | — |  |  |  | 4,025 |  |  |  | — |  |  |  | 4,025 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Other |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,988 |  |  |  | — |  |  |  | 1,988 |
Cash and cash equivalents |  |  | 818 |  |  |  | — |  |  |  | — |  |  |  | 818 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 818 |  |  | $ | 80,599 |  |  | $ | — |  |  | $ | 81,417 |  |  | $ | — |  |  | $ | 1,988 |  |  | $ | — |  |  | $ | 1,988 |
|  | December 31, 2023 |
|  | 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 |  | $ | — |  |  | $ | 89,971 |  |  | $ | — |  |  | $ | 89,971 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
U.S. government securities |  |  | — |  |  |  | 15,817 |  |  |  | — |  |  |  | 15,817 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Global equity |  |  | — |  |  |  | 5,691 |  |  |  | — |  |  |  | 5,691 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Other |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,929 |  |  |  | — |  |  |  | 1,929 |
Cash and cash equivalents |  |  | 1,138 |  |  |  | — |  |  |  | — |  |  |  | 1,138 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 1,138 |  |  | $ | 111,479 |  |  | $ | — |  |  | $ | 112,617 |  |  | $ | — |  |  | $ | 1,929 |  |  | $ | — |  |  | $ | 1,929 |
Expected Future Benefit Payments | Future benefit payments are expected to be paid as follows:
|  | United States |  |  | Foreign |
|  | (in thousands) |
2025 |  | $ | 9,202 |  |  | $ | 1,077 |
2026 |  |  | 8,152 |  |  |  | 1,208 |
2027 |  |  | 9,043 |  |  |  | 1,245 |
2028 |  |  | 9,135 |  |  |  | 1,253 |
2029 |  |  | 9,040 |  |  |  | 1,422 |
2030-2034 |  |  | 42,009 |  |  |  | 8,561 |
Postretirement Benefit Plans |
Defined Benefit Plan Disclosure [Line Items] |
Defined Benefit Pension and Postretirement Benefit Plan Assets and Obligations | The December 31 balances of the postretirement assets and obligations are shown below:
|  | 2024 |  |  | 2023 |
|  | (in thousands) |
Assets and Obligations |  |  |  |  |  |
Change in benefit obligation: |  |  |  |  |  |
Projected benefit obligation: |  |  |  |  |  |
Beginning of year |  | $ | 6,933 |  |  | $ | 5,345 |
Service cost |  |  | 37 |  |  |  | 34 |
Interest cost |  |  | 289 |  |  |  | 299 |
Actuarial (gain) loss |  |  | (445 | ) |  |  | 155 |
Benefits paid |  |  | (1,685 | ) |  |  | (1,413 | )
Special termination benefits |  |  | 462 |  |  |  | 2,513 |
End of year |  |  | 5,591 |  |  |  | 6,933 |
Change in plan assets: |  |  |  |  |  |
Fair value of plan assets: |  |  |  |  |  |
Beginning of year |  |  | — |  |  |  | — |
Company contributions |  |  | 1,685 |  |  |  | 1,413 |
Benefits paid |  |  | (1,685 | ) |  |  | (1,413 | )
End of year |  |  | — |  |  |  | — |
Funded status |  | $ | (5,591 | ) |  | $ | (6,933 | )
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:
|  | 2024 |  |  | 2023 |
|  | (in thousands) |
Accrued employees’ compensation and withholdings |  | $ | (938 | ) |  | $ | (1,508 | )
Retirement plans liabilities |  |  | (4,653 | ) |  |  | (5,425 | )
Funded status |  | $ | (5,591 | ) |  | $ | (6,933 | )
Amounts Recognized in Accumulated Other Comprehensive Income (loss) | The following table provides amounts recognized in accumulated other comprehensive income (loss) as of December 31:
|  | 2024 |  |  | 2023 |
|  | (in thousands) |
Prior service credit, before tax |  | $ | (14 | ) |  | $ | (23 | )
Deferred taxes |  |  | (1,693 | ) |  |  | (1,691 | )
Total recognized in other comprehensive income (loss), net of tax |  | $ | (1,707 | ) |  | $ | (1,714 | )
Net Periodic Pension and Postretirement Benefit Cost (Income) | For the years ended December 31, 2024, 2023, and 2022, Teradyne’s net periodic postretirement benefit cost (income) was comprised of the following:
|  | 2024 |  |  | 2023 |  |  | 2022 |
|  | (in thousands) |
Components of Net Periodic Postretirement Benefit Cost (income): |
Service cost |  | $ | 37 |  |  | $ | 34 |  |  | $ | 64 |
Interest cost |  |  | 289 |  |  |  | 299 |  |  |  | 177 |
Amortization of prior service credit |  |  | (9 | ) |  |  | (9 | ) |  |  | (9 | )
Net actuarial (gain) loss |  |  | (445 | ) |  |  | 155 |  |  |  | (1,155 | )
Special termination benefits |  |  | 462 |  |  |  | 2,513 |  |  |  | — |
Total net periodic postretirement benefit cost (income) |  |  | 334 |  |  |  | 2,992 |  |  |  | (923 | )
Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income: |  |  |  |  |  |  |  |  |
Reversal of amortization items: |  |  |  |  |  |  |  |  |
Prior service credit |  |  | 9 |  |  |  | 9 |  |  |  | 9 |
Total recognized in other comprehensive income |  |  | 9 |  |  |  | 9 |  |  |  | 9 |
Total recognized in net periodic postretirement cost (income) and other comprehensive income |  | $ | 343 |  |  | $ | 3,001 |  |  | $ | (914 | )
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:
|  | 2024 |  |  | 2023 |  |  | 2022 |
Discount rate |  |  | 4.7 | % |  |  | 5.0 | % |  |  | 2.6 | %
Initial health care cost trend rate |  |  | 7.7 |  |  |  | 7.2 |  |  |  | 7.3 |
Ultimate health care cost trend rate |  |  | 4.5 |  |  |  | 4.5 |  |  |  | 4.5 |
Year in which ultimate health care cost trend rate is reached |  | 2033 |  |  | 2032 |  |  | 2029 |
Weighted Average Assumptions to Determine Postretirement Benefit Obligation as of December 31:
|  | 2024 |  |  | 2023 |  |  | 2022 |
Discount rate |  |  | 5.4 | % |  |  | 4.7 | % |  |  | 5.0 | %
Initial health care trend |  |  | 8.6 |  |  |  | 7.7 |  |  |  | 7.2 |
Ultimate health care trend |  |  | 4.5 |  |  |  | 4.5 |  |  |  | 4.5 |
Medical cost trend rate decrease to ultimate rate in year |  |  | 2035 |  |  |  | 2033 |  |  |  | 2032 |
Expected Future Benefit Payments | Future benefit payments are expected to be paid as follows:
|  | Benefit Payments |
|  | (in thousands) |
2025 |  | $ | 938 |
2026 |  |  | 671 |
2027 |  |  | 585 |
2028 |  |  | 510 |
2029 |  |  | 414 |
2030-2034 |  |  | 1,719 |

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