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Retirement Plans (Tables) | 3 Months Ended
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Apr. 03, 2016
Postretirement Benefit Plans |
Net Periodic Pension and Postretirement (Income) Cost | For the three months ended April 3, 2016 and April 5, 2015, Teradyne’s net periodic postretirement benefit income was comprised of the following:
|  | For the Three Months Ended |
|  | April 3, 2016 |  |  | April 5, 2015 |
|  | (in thousands) |
Service cost |  | $ | 10 |  |  | $ | 12 |
Interest cost |  |  | 56 |  |  |  | 59 |
Amortization of prior service benefit |  |  | (150 | ) |  |  | (149 | )
Total net periodic post-retirement benefit |  | $ | (84 | ) |  | $ | (78 | )
Defined Benefit Pension Plans |
Net Periodic Pension and Postretirement (Income) Cost | For the three months ended April 3, 2016 and April 5, 2015, Teradyne’s net periodic pension (income) cost was comprised of the following:
|  | For the Three Months Ended |
|  | April 3, 2016 |  |  | April 5, 2015 |
|  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |
|  | (in thousands) |
Service cost |  | $ | 576 |  |  | $ | 207 |  |  | $ | 616 |  |  | $ | 247 |
Interest cost |  |  | 3,414 |  |  |  | 206 |  |  |  | 3,282 |  |  |  | 358 |
Expected return on plan assets |  |  | (3,443 | ) |  |  | (5 | ) |  |  | (3,624 | ) |  |  | (195 | )
Amortization of prior service cost |  |  | 24 |  |  |  | — |  |  |  | 33 |  |  |  | — |
Net actuarial gain |  |  | (1,193 | ) |  |  | — |  |  |  | — |  |  |  | — |
Settlement |  |  | — |  |  |  | (239 | ) |  |  | — |  |  |  | — |
Total net periodic pension (income) cost |  | $ | (622 | ) |  | $ | 169 |  |  | $ | 307 |  |  | $ | 410 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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