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Debt (Tables) | 9 Months Ended
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Oct. 04, 2015
Interest Expense on Convertible Senior Notes | The interest expense on Teradyne’s convertible senior notes for the nine months ended October 4, 2015 and September 28, 2014 was as follows:
|  | For the Nine Months Ended |
|  | October 4, 2015 |  |  | September 28, 2014 |
|  | (in thousands) |
Contractual interest expense on the coupon |  | $ | — |  |  | $ | 1,757 |
Amortization of the discount component and debt issuance fees recognized as interest expense |  |  | — |  |  |  | 4,493 |
Total interest expense on the convertible debt |  | $ | — |  |  | $ | 6,250 |

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- Definition Schedule of Interest Expense Related to Convertible Debt. + References No definition available. + Details
Name: | ter_ScheduleOfInterestExpenseRelatedToConvertibleDebtTableTextBlock
Namespace Prefix: | ter_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration