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Stock Plans (Tables)
 12 Months Ended
Dec. 31, 2023
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 options, restricted stock, restricted stock units, performance restricted stock units, performance units and stock grants, included in the Company’s consolidated statements of operations:
 December 31,
2023		January 1,
2023		January 2,
2022
 (In thousands)
Cost of product and service revenue$4,224 $7,459 $3,193 
Research and development expenses5,276 6,799 2,393 
Selling, general and administrative expenses31,910 37,260 24,089 
Total stock-based compensation expense$41,410 $51,518 $29,675 
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 for the fiscal years ended:
 
December 31,
2023		January 1,
2023		January 2,
2022
Risk-free interest rate4.1 %2.3 %0.9 %
Expected dividend yield0.2 %0.2 %0.2 %
Expected lives5 years5 years5 years
Expected stock volatility32.7 %28.5 %27.3 %
Summary of Stock Option Activity
The following table summarizes stock option activity for the fiscal year ended December 31, 2023:
 
 Number
of
Shares		Weighted-
Average Exercise
Price
 (Shares in thousands)
Outstanding at beginning of year1,048 $132.32 
Granted168 128.35 
Exercised(58)76.12 
Canceled(49)154.37 
Forfeited(36)146.13 
Outstanding at end of year1,073 $133.28 
Exercisable at end of year693 $125.06 
Summary of Restricted Stock Award Activity
The following table summarizes restricted stock award activity for the fiscal year ended December 31, 2023:
 
Number
of
Shares		Weighted-
Average
Grant-
Date Fair
Value
 (Shares in thousands)
Nonvested at beginning of year453 $152.79 
Granted139 128.79 
Vested(221)142.69 
Forfeited(30)147.80 
Nonvested at end of year341 $149.98