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Computation of Basic and Diluted Net Income Per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jul. 02, 2023
Jun. 30, 2024
Jul. 02, 2023
Net Income Loss Per Common Share        
Net Income (Loss) $ 186,273 $ 120,050 $ 250,470 $ 203,581
Weighted average common shares-basic 157,804,000 154,760,000 155,426,000 155,332,000
Convertible note hedge warrant shares [1] 4,930,000 8,876,000 6,896,000 8,929,000
Incremental shares from assumed conversion of convertible notes [2] 0 742,000 0 828,000
Incremental Common Shares Attributable to Dilutive Effect of Equity Unit Purchase Agreements 1,000 7,000 2 7
Weighted Average Number of Shares Outstanding, Diluted, Adjustment, Total 5,666,000 9,991,000 7,483,000 10,198,000
Weighted average common shares-diluted 163,470,000 164,751,000 162,909,000 165,530,000
Earnings Per Share, Basic $ 1.18 $ 0.78 $ 1.61 $ 1.31
Earnings Per Share, Diluted $ 1.14 $ 0.73 $ 1.54 $ 1.23
Restricted Stock Units        
Net Income Loss Per Common Share        
Incremental shares attributable to share based payment arrangements 726,000 323,000 573 389
Employee Stock Option [Member]        
Net Income Loss Per Common Share        
Incremental shares attributable to share based payment arrangements 9,000 43,000 12 45
[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.
[2] Incremental shares from assumed conversion of the convertible notes were calculated using the difference between the average Teradyne stock price for the period and the conversion price, multiplied by the number of convertible notes shares. The result of this calculation, representing the total intrinsic value of the convertible notes, was divided by the average Teradyne stock price for the period.