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Retirement Plans (Tables) | 3 Months Ended
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Apr. 04, 2021
Defined Benefit Pension Plans |
Net Periodic Pension and Postretirement Benefit Costs | For the three months ended April 4, 2021 and March 29, 2020, Teradyne’s net periodic pension cost was comprised of the following:
|  | For the Three Months Ended |
|  | April 4, 2021 |  |  | March 29, 2020 |
|  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |
|  | (in thousands) |
Service cost |  | $ | 453 |  |  | $ | 243 |  |  | $ | 433 |  |  | $ | 201 |
Interest cost |  |  | 1,100 |  |  |  | 87 |  |  |  | 1,522 |  |  |  | 115 |
Expected return on plan assets |  |  | (936 | ) |  |  | (16 | ) |  |  | (1,233 | ) |  |  | (15 | )
Total net periodic pension cost |  | $ | 617 |  |  | $ | 314 |  |  | $ | 722 |  |  | $ | 301 |
Postretirement Benefit Plans |
Net Periodic Pension and Postretirement Benefit Costs | For the three months ended April 4, 2021 and March 29, 2020, Teradyne’s net periodic postretirement benefit cost was comprised of the following:
|  | For the Three Months Ended |
|  | April 4, 2021 |  |  | March 29, 2020 |
|  | (in thousands) |
Service cost |  | $ | 16 |  |  | $ | 11 |
Interest cost |  |  | 44 |  |  |  | 62 |
Amortization of prior service credit |  |  | (2 | ) |  |  | (2 | )
Total net periodic postretirement benefit cost |  | $ | 58 |  |  | $ | 71 |

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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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