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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 28, 2020
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 28,
2020
    
June 30,
2019
  
Risk-free interest rate
      1.5 %      2.6 % 
Teradyne volatility-historical
      34.9 %      31.9 % 
NYSE Composite Index volatility-historical
      11.4 %      11.9 % 
Dividend yield
      0.6 %      1.0 % 
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 28,
2020
    
June 30,
2019
  
Expected life (years)
      5.0       5.0  
Risk-free interest rate
      1.6 %      2.5 % 
Volatility-historical
      31.6 %      30.1 % 
Dividend yield
      0.6 %      1.0 %