Computation of Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2024	Apr. 02, 2023
Net Income Loss Per Common Share
Net Income (Loss)		$ 64,197	$ 83,531
Weighted average common shares-basic		153,047	155,904
Convertible note hedge warrant shares	[1]	8,862	8,983
Incremental shares from assumed conversion of convertible notes	[2]	0	914
Incremental Common Shares Attributable to Dilutive Effect of Equity Unit Purchase Agreements		4	6
Weighted Average Number of Shares Outstanding, Diluted, Adjustment, Total		9,301	10,404
Weighted average common shares-diluted		162,348	166,308
Earnings Per Share, Basic		$ 0.42	$ 0.54
Earnings Per Share, Diluted		$ 0.4	$ 0.5
Restricted Stock Units
Net Income Loss Per Common Share
Incremental shares attributable to share based payment arrangements		419	453
Employee Stock Option [Member]
Net Income Loss Per Common Share
Incremental shares attributable to share based payment arrangements		16	48

[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.