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Retirement Plans (Tables) | 3 Months Ended
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Mar. 31, 2013
Defined Benefit Pension Plans |
Net Periodic Pension Cost | Teradyne’s net periodic pension cost was comprised of the following:
|  | For the Three Months Ended |
|  | March 31, 2013 |  |  | April 1, 2012 |
|  | (in thousands) |
Service cost |  | $ | 834 |  |  | $ | 722 |
Interest cost |  |  | 3,294 |  |  |  | 4,083 |
Expected return on plan assets |  |  | (3,630 | ) |  |  | (4,087 | )
Amortization of unrecognized prior service cost |  |  | 41 |  |  |  | 58 |
Settlement loss |  |  | 76 |  |  |  | — |
Total net periodic pension cost |  | $ | 615 |  |  | $ | 776 |
Post-Retirement Benefit Plans |
Net Periodic Pension Cost | Teradyne’s net periodic postretirement benefit was comprised of the following:
|  | For the Three Months Ended |
|  | March 31, 2013 |  |  | April, 2012 |
|  | (in thousands) |
Service cost |  | $ | 16 |  |  | $ | 19 |
Interest cost |  |  | 87 |  |  |  | 110 |
Amortization of unrecognized prior service benefit |  |  | (150 | ) |  |  | (150 | )
Total net periodic postretirement benefit |  | $ | (47 | ) |  | $ | (21 | )

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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=21915506&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration