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Retirement Plans (Tables) | 3 Months Ended
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Mar. 30, 2014
Postretirement Benefit Plans |
Net Periodic Pension and Postretirement Cost (Benefit) | For the three months ended March 30, 2014 and March 31, 2013, Teradyne’s net periodic postretirement benefit was comprised of the following:
|  | For the Three Months Ended |
|  | March 30, 2014 |  |  | March 31, 2013 |
|  | (in thousands) |
Service cost |  | $ | 13 |  |  | $ | 16 |
Interest cost |  |  | 86 |  |  |  | 87 |
Amortization of unrecognized prior service benefit |  |  | (150 | ) |  |  | (150 | )
Total net periodic postretirement benefit |  | $ | (51 | ) |  | $ | (47 | )
Defined Benefit Pension Plans |
Net Periodic Pension and Postretirement Cost (Benefit) | For the three months ended March 30, 2014 and March 31, 2013, Teradyne’s net periodic pension cost was comprised of the following:
|  | For the Three Months Ended |
|  | March 30, 2014 |  |  | March 31, 2013 |
|  | (in thousands) |
Service cost |  | $ | 796 |  |  | $ | 834 |
Interest cost |  |  | 3,720 |  |  |  | 3,370 |
Expected return on plan assets |  |  | (3,342 | ) |  |  | (3,630 | )
Amortization of unrecognized prior service cost |  |  | 34 |  |  |  | 41 |
Total net periodic pension cost |  | $ | 1,208 |  |  | $ | 615 |

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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=28361610&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration