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Stock-Based Compensation Plans (Tables)
 9 Months Ended
Jan. 02, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock-Based compensation expense
The following table summarizes stock-based compensation expense related to stock awards granted under the Company’s equity incentive plans and rights to acquire stock granted under the Company’s Employee Stock Purchase Plan (ESPP):
Three Months EndedNine Months Ended
(In thousands)January 2, 2021December 28, 2019January 2, 2021December 28, 2019
Stock-based compensation included in:
Cost of revenues$3,465 $2,961 $9,149 $8,386 
Research and development40,228 31,543 106,707 86,119 
Selling, general and administrative22,638 15,653 59,297 48,227 
$66,331 $50,157 $175,153 $142,732 
Schedule of Share-based compensation, restricted stock units, valuation assumption [Table Text Block] The per share weighted-average fair value of RSUs granted during the third quarter of fiscal 2021 was $143.18 ($89.57 for the third quarter of fiscal 2020), which were calculated based on estimates at the date of grant using the following weighted-average assumptions: 
Three Months EndedNine Months Ended
January 2, 2021December 28, 2019January 2, 2021December 28, 2019
Risk-free interest rate0.2 %1.6 %0.2 %1.8 %
Dividend yield— %1.6 %1.2 %1.3 %
Fair value assumptions of stock purchase plan rights The fair values of stock purchase plan rights granted in the second quarter of fiscal 2021 and 2020 were estimated using the Black-Scholes option pricing model at the date of grant using the following assumptions:
20212020
Expected life of options (years)1.251.25
Expected stock price volatility0.380.37
Risk-free interest rate0.1 %1.9 %
Dividend yield1.4 %1.3 %
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of restricted stock unit activity and related information
A summary of the Company’s RSU activity and related information is as follows:
 
 RSUs Outstanding
(Shares in thousands)Number of SharesWeighted-Average Grant-Date Fair Value Per Share
March 30, 20197,331 $59.54 
Granted2,756 $109.53 
Vested(2,820)$55.24 
Cancelled(487)$75.09 
March 28, 20206,780 $80.53 
Granted3,785 $105.48 
Vested(2,387)$70.61 
Cancelled(594)$83.77 
January 2, 20217,584 $95.46