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Stock Plans (Tables)
 6 Months Ended
Jul. 05, 2020
Share-based Payment Arrangement [Abstract]  
Summary of Total Compensation Recognized Related to Outstanding Equity Awards The following table summarizes total pre-tax compensation expense recognized related to the Company’s stock option grants, restricted stock awards, performance restricted stock units, performance units and stock awards, included in the
Company’s condensed consolidated statements of operations for the three and six months ended July 5, 2020 and June 30, 2019:
 Three Months EndedSix Months Ended
 July 5,
2020		June 30,
2019		July 5,
2020		June 30,
2019
 (In thousands)
Cost of revenue$253  $377  $507  $711  
Research and development expenses316  333  588  624  
Selling, general and administrative expenses9,034  5,993  11,558  11,466  
Total stock-based compensation expense$9,603  $6,703  $12,653  $12,801  
The total income tax benefit recognized in the condensed consolidated statements of operations for stock-based compensation was $3.3 million and $5.5 million for the three and six months ended July 5, 2020, respectively. The total income tax benefit recognized in the condensed consolidated statements of operations for stock-based compensation was $3.0 million and $7.2 million for the three and six months ended June 30, 2019, respectively. Stock-based compensation costs capitalized as part of inventory were $0.5 million as of each of July 5, 2020 and June 30, 2019, respectively.
Weighted-Average Assumptions Used in the Black-Scholes Option Pricing Model The Company’s weighted-average assumptions used in the Black-Scholes option pricing model were as follows:
 Three and Six Months Ended
 July 5,
2020		June 30,
2019
Risk-free interest rate0.9 %1.9 %
Expected dividend yield0.3 %0.3 %
Expected term5 years5 years
Expected stock volatility23.8 %22.8 %
Summary of Stock Option Activity
The following table summarizes stock option activity for the six months ended July 5, 2020:
Number
of
Shares		Weighted-
Average Exercise
Price		Weighted-Average
Remaining
Contractual 
Term		Total
Intrinsic
Value
 (In thousands) (In years)(In millions)
Outstanding at December 29, 20191,535  $60.42  
Granted266  86.87  
Exercised(196) 51.35  
Forfeited(65) 87.41  
Outstanding at July 5, 20201,540  $65.00  3.6$50.7  
Exercisable at July 5, 20201,123  $56.75  2.7$46.2  
Summary of Restricted Stock Award Activity The following table summarizes restricted stock award activity for the six months ended July 5, 2020:
Number of
Shares		Weighted-
Average
Grant-
Date Fair
Value
 (In thousands) 
Nonvested at December 29, 2019345  $78.69  
Granted181  84.13  
Vested(181) 71.80  
Forfeited(28) 84.80  
Nonvested at July 5, 2020317  $85.20