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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 6 Months Ended
Jun. 28, 2020
Jun. 30, 2019
Jun. 28, 2020
Jun. 30, 2019
Net Income Loss Per Common Share        
Net income for basic and diluted net income per share $ 188,908 $ 97,397 $ 365,098 $ 206,535
Weighted average common shares-basic 165,789 171,241 166,189 172,387
Incremental shares from assumed conversion of convertible notes [1] 7,599 4,364 7,466 3,275
Convertible note hedge warrant shares [2] 5,824 1,778 5,658 889
Employee stock purchase plan 0 22 13 16
Dilutive potential common shares 14,468 7,349 14,308 5,394
Weighted average common shares-diluted 180,257 178,590 180,497 177,781
Net income per common share-basic $ 1.14 $ 0.57 $ 2.20 $ 1.20
Net income per common share-diluted $ 1.05 $ 0.55 $ 2.02 $ 1.16
Restricted Stock Units        
Net Income Loss Per Common Share        
Incremental shares attributable to share based payment arrangements 913 1,002 1,038 1,012
Stock Options        
Net Income Loss Per Common Share        
Incremental shares attributable to share based payment arrangements 132 183 133 202
[1] Incremental shares from assumed conversion of the convertible notes was calculated using the difference between the average Teradyne stock price for the period and the conversion price of $31.59, multiplied by 14.6 million shares. The result of this calculation, representing the total intrinsic value of the convertible debt, was divided by the average Teradyne stock price for the period.
[2] Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price of $39.64, multiplied by 14.6 million 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.