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Computation of Basic and Diluted Net Income Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 28, 2025
Sep. 29, 2024
Sep. 28, 2025
Sep. 29, 2024
Net Income Loss Per Common Share        
Net Income (Loss) $ 119,558 $ 145,649 $ 296,827 $ 396,119
Weighted average common shares-basic 158,595 163,002 160,021 157,951
Convertible note hedge warrant shares [1] 0 460 0 4,751
Incremental Common Shares Attributable to Dilutive Effect of Equity Unit Purchase Agreements 3 10 19 5
Dilutive potential common shares 502 1,251 388 5,406
Weighted average common shares-diluted 159,097 164,253 160,409 163,357
Net income per common share-basic $ 0.75 $ 0.89 $ 1.85 $ 2.51
Net income per common share-diluted $ 0.75 $ 0.89 $ 1.85 $ 2.42
Restricted Stock Units        
Net Income Loss Per Common Share        
Incremental shares attributable to share based payment arrangements 495 768 366 637
Employee Stock Option [Member]        
Net Income Loss Per Common Share        
Incremental shares attributable to share based payment arrangements 4 13 3 13
[1] Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price, multiplied by the number of warrant shares. The result of this calculation, representing the total intrinsic value of the warrant, was divided by the average Teradyne stock price for the period.