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Debt (Tables) | 9 Months Ended
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Sep. 27, 2020
Components of Convertible Senior Notes | The below tables represent the key components of Teradyne’s convertible senior notes:
|  | September 27, 2020 |  |  | December 31, 2019 |
|  | (in thousands) |
Debt Principal |  | $ | 459,973 |  |  | $ | 460,000 |
Unamortized discount |  |  | 53,795 |  |  |  | 65,313 |
Net Carrying amount of convertible debt |  | $ | 406,178 |  |  | $ | 394,687 |
|  | For the Three Months Ended |  |  | For the Nine Months Ended |
|  | September 27, 2020 |  |  | September 29, 2019 |  |  | September 27, 2020 |  |  | September 29, 2019 |
|  | (in thousands) |  |  | (in thousands) |
Contractual interest expense on the coupon |  | $ | 1,438 |  |  | $ | 1,438 |  |  | $ | 4,313 |  |  | $ | 4,313 |
Amortization of the discount component and debt issue fees recognized as interest expense |  |  | 3,887 |  |  |  | 3,699 |  |  |  | 11,518 |  |  |  | 10,961 |
Total interest expense on the convertible debt |  | $ | 5,325 |  |  | $ | 5,137 |  |  | $ | 15,831 |  |  | $ | 15,274 |

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration