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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. 27, 2020
Sep. 29, 2019
Sep. 27, 2020
Sep. 29, 2019
Net Income Loss Per Common Share        
Net income for basic and diluted net income per share $ 222,718 $ 135,860 $ 587,815 $ 342,395
Weighted average common shares-basic 166,014 169,641 166,131 171,471
Incremental shares from assumed conversion of convertible notes [1] 9,156 5,800 8,029 4,117
Convertible note hedge warrant shares [2] 7,775 3,580 6,364 1,786
Employee stock purchase plan 15 5 13 13
Dilutive potential common shares 18,324 10,853 15,646 7,214
Weighted average common shares-diluted 184,338 180,494 181,777 178,685
Net income per common share-basic $ 1.34 $ 0.80 $ 3.54 $ 2.00
Net income per common share-diluted $ 1.21 $ 0.75 $ 3.23 $ 1.92
Restricted Stock Units        
Net Income Loss Per Common Share        
Incremental shares attributable to share based payment arrangements 1,237 1,313 1,104 1,112
Stock Options        
Net Income Loss Per Common Share        
Incremental shares attributable to share based payment arrangements 141 155 136 186
[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 $31.57, 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 $39.62, 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.