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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2019
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 Six Months
Ended
 
 
June 30,
2019
   
July 1,
2018
 
Risk-free interest rate
   
2.6
 %    
2.2
 %
Teradyne volatility-historical
   
31.9
 %    
26.8
 %
NYSE Composite Index volatility-historical
   
11.9
 %    
12.4
 %
Dividend yield
   
1.0
 %    
0.8
 %
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 Six Months
Ended
 
 
June 30,
2019
   
July 1,
2018
 
Expected life (years)
   
5.0
     
5.0
 
Risk-free interest rate
   
2.5
 %    
2.4
 %
Volatility-historical
   
30.1
 %    
26.4
 %
Dividend yield
   
1.0
 %    
0.8
 %