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Retirement Plans (Tables) | 9 Months Ended
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Oct. 03, 2021
Defined Benefit Pension Plans |
Net Periodic Pension and Postretirement Benefit Costs | For the three and nine months ended October 3, 2021 and September 27, 2020, Teradyne’s net periodic pension cost was comprised of the following components:
|  | For the Three Months Ended |
|  | October 3, 2021 |  |  | September 27, 2020 |
|  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |
|  | (in thousands) |
Service cost |  | $ | 452 |  |  | $ | 240 |  |  | $ | 417 |  |  | $ | 216 |
Interest cost |  |  | 1,098 |  |  |  | 86 |  |  |  | 1,460 |  |  |  | 123 |
Expected return on plan assets |  |  | (936 | ) |  |  | (17 | ) |  |  | (1,170 | ) |  |  | (16 | )
Net actuarial loss |  |  | — |  |  |  | — |  |  |  | 2,238 |  |  |  | — |
Settlement loss |  |  | — |  |  |  | — |  |  |  | 450 |  |  |  | — |
Total net periodic pension cost |  | $ | 614 |  |  | $ | 309 |  |  | $ | 3,395 |  |  | $ | 323 |
|  | For the Nine Months Ended |
|  | October 3, 2021 |  |  | September 27, 2020 |
|  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |
|  | (in thousands) |
Service cost |  | $ | 1,357 |  |  | $ | 720 |  |  | $ | 1,283 |  |  | $ | 648 |
Interest cost |  |  | 3,295 |  |  |  | 257 |  |  |  | 4,505 |  |  |  | 369 |
Expected return on plan assets |  |  | (2,809 | ) |  |  | (50 | ) |  |  | (3,634 | ) |  |  | (47 | )
Net actuarial (gain) loss |  |  | (400 | ) |  |  | — |  |  |  | 2,418 |  |  |  | — |
Settlement loss |  |  | — |  |  |  | — |  |  |  | 450 |  |  |  | — |
Total net periodic pension cost |  | $ | 1,443 |  |  | $ | 927 |  |  | $ | 5,022 |  |  | $ | 970 |
Postretirement Benefit Plans |
Net Periodic Pension and Postretirement Benefit Costs | For the three and nine months ended October 3, 2021 and September 27, 2020, Teradyne’s net periodic postretirement benefit cost (credit) was comprised of the following components:
|  | For the Three Months Ended |  |  | For the Nine Months Ended |
|  | October 3, 2021 |  |  | September 27, 2020 |  |  | October 3, 2021 |  |  | September 27, 2020 |
|  | (in thousands) |
Service cost |  | $ | 16 |  |  | $ | 14 |  |  | $ | 48 |  |  | $ | 43 |
Interest cost |  |  | 43 |  |  |  | 60 |  |  |  | 128 |  |  |  | 180 |
Amortization of prior service credit |  |  | (2 | ) |  |  | (2 | ) |  |  | (7 | ) |  |  | (7 | )
Net actuarial gain |  |  | — |  |  |  | — |  |  |  | (228 | ) |  |  | (279 | )
Total net periodic postretirement benefit cost (credit) |  | $ | 57 |  |  | $ | 72 |  |  | $ | (59 | ) |  | $ | (63 | )

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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=123447040&loc=d3e1928-114920 + Details
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