Computation of Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
		Apr. 02, 2023	Apr. 03, 2022
Net Income Loss Per Common Share
Net income for basic and diluted net income per share		$ 83,531	$ 161,928
Weighted average common shares-basic		155,904	162,048
Convertible note hedge warrant shares	[1]	8,983	10,028
Incremental shares from assumed conversion of convertible notes	[2]	914	2,541
Employee stock purchase rights		6	14
Dilutive potential common shares		10,404	13,527
Weighted average common shares-diluted		166,308	175,575
Net income per common share-basic		$ 0.54	$ 1
Net income per common share-diluted		$ 0.5	$ 0.92
Restricted Stock Units
Net Income Loss Per Common Share
Incremental shares attributable to share based payment arrangements		453	875
Stock Options
Net Income Loss Per Common Share
Incremental shares attributable to share based payment arrangements		48	69

[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 debt, was divided by the average Teradyne stock price for the period.