Stock-Based Compensation (Tables)

3 Months Ended

Mar. 29, 2026

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Estimated Fair Value of TSR Performance-Based Restricted Stock Unit Awards Assumptions

The grant date fair value was estimated using the Monte Carlo simulation model with the following assumptions:

	For the Three Months  Ended
	March 29, 2026			March 30, 2025
Risk-free interest rate		3.6	%		4.2	%
Teradyne volatility-historical		47.5	%		41.7	%
S&P 500 Constituents volatility-historical		27.6	%
NYSE Composite Index volatility-historical					14.9	%
Dividend yield		0.2	%		0.4	%

Fair Value of Stock Options Using Assumptions

The fair value of stock options was estimated using the Black-Scholes option-pricing model with the following assumptions:

	For the Three Months  Ended
	March 29, 2026			March 30, 2025
Expected life (years)		3.5			4.0
Risk-free interest rate		3.7	%		4.3	%
Volatility-historical		46.9	%		44.0	%
Dividend yield		0.2	%		0.4	%