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Interest Expense on Teradyne's Senior Notes (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Debt Disclosure [Abstract] |  |
Contractual interest expense on the coupon | $ 0 | $ 312
Amortization of the issuance fees recognized as interest expense | 0 | 113
Total interest expense on the convertible debt | $ 0 | $ 425

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