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Retirement Plans (Tables) | 9 Months Ended
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Oct. 04, 2015
Postretirement Benefit Plans |
Net Periodic Pension and Postretirement Benefit Income Costs | For the three and nine months ended October 4, 2015 and September 28, 2014, Teradyne’s net periodic pension cost was comprised of the following:
|  | For the Three Months Ended |
|  | October 4, 2015 |  |  | September 28, 2014 |
|  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |
|  | (in thousands) |
Service cost |  | $ | 616 |  |  | $ | 259 |  |  | $ | 555 |  |  | $ | 206 |
Interest cost |  |  | 3,285 |  |  |  | 357 |  |  |  | 3,219 |  |  |  | 431 |
Expected return on plan assets |  |  | (3,629 | ) |  |  | (185 | ) |  |  | (3,126 | ) |  |  | (209 | )
Amortization of prior service cost |  |  | 34 |  |  |  | — |  |  |  | 34 |  |  |  | — |
Total net periodic pension cost |  | $ | 306 |  |  | $ | 431 |  |  | $ | 682 |  |  | $ | 428 |
|  | For the Nine Months Ended |
|  | October 4, 2015 |  |  | September 28, 2014 |
|  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |
|  | (in thousands) |
Service cost |  | $ | 1,847 |  |  | $ | 768 |  |  | $ | 1,663 |  |  | $ | 705 |
Interest cost |  |  | 9,856 |  |  |  | 1,101 |  |  |  | 9,656 |  |  |  | 1,446 |
Expected return on plan assets |  |  | (10,888 | ) |  |  | (595 | ) |  |  | (9,375 | ) |  |  | (685 | )
Amortization of prior service cost |  |  | 101 |  |  |  | — |  |  |  | 101 |  |  |  | — |
Actuarial (gain) loss |  |  | (3 | ) |  |  | — |  |  |  | 362 |  |  |  | — |
Total net periodic pension cost |  | $ | 913 |  |  | $ | 1,274 |  |  | $ | 2,407 |  |  | $ | 1,466 |
Defined Benefit Pension Plans |
Net Periodic Pension and Postretirement Benefit Income Costs | For the three and nine months ended October 4, 2015 and September 28, 2014, Teradyne’s net periodic postretirement benefit income was comprised of the following:
|  | For the Three Months Ended |  |  | For the Nine Months Ended |
|  | October 4, 2015 |  |  | September 28, 2014 |  |  | October 4, 2015 |  |  | September 28, 2014 |
|  | (in thousands) |
Service cost |  | $ | 12 |  |  | $ | 15 |  |  | $ | 36 |  |  | $ | 44 |
Interest cost |  |  | 59 |  |  |  | 84 |  |  |  | 177 |  |  |  | 252 |
Amortization of prior service benefit |  |  | (150 | ) |  |  | (150 | ) |  |  | (449 | ) |  |  | (449 | )
Actuarial gain |  |  | — |  |  |  | — |  |  |  | (19 | ) |  |  | (247 | )
Total net periodic post-retirement benefit |  | $ | (79 | ) |  | $ | (51 | ) |  | $ | (255 | ) |  | $ | (400 | )

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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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