Stock-Based Compensation (Tables)

9 Months Ended

Oct. 02, 2016

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

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

	For the Nine Months Ended
	October 2, 2016			October 4, 2015
Risk-free interest rate		0.97	%		0.77	%
Teradyne volatility-historical		27.0	%		28.2	%
NYSE Composite Index volatility-historical		13.1	%		—
Philadelphia Semiconductor Index volatility-historical		—			19.7	%
Dividend yield		1.24	%		1.33	%

Stock Options

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 Nine Months Ended
	October 2, 2016			October 4, 2015
Expected life (years)		5.0			4.0
Risk-free interest rate		1.4	%		1.1	%
Volatility-historical		32.9	%		33.4	%
Dividend yield		1.24	%		1.33	%