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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
Mar. 30, 2025
Mar. 31, 2024
Net Income Loss Per Common Share    
Net Income (Loss) $ 98,896 $ 64,197
Weighted average common shares-basic 161,501 153,047
Convertible note hedge warrant shares [1]   8,862
Incremental Common Shares Attributable to Dilutive Effect of Equity Unit Purchase Agreements 46 4
Dilutive potential common shares 495 9,301
Weighted average common shares-diluted 161,996 162,348
Net income per common share-basic $ 0.61 $ 0.42
Net income per common share-diluted $ 0.61 $ 0.4
Restricted Stock Units    
Net Income Loss Per Common Share    
Incremental shares attributable to share based payment arrangements 444 419
Employee Stock Option [Member]    
Net Income Loss Per Common Share    
Incremental shares attributable to share based payment arrangements 5 16
[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.