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Stock-Based Compensation Plans (Tables)
 3 Months Ended
Jun. 27, 2020
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 Ended
(In thousands)June 27, 2020June 29, 2019
Stock-based compensation included in:
Cost of revenues$2,721  $2,613  
Research and development30,369  24,874  
Selling, general and administrative17,293  15,266  
$50,383  $42,753  
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 first quarter of fiscal 2021 was $84.34 ($98.73 for the first quarter of fiscal 2020), which were calculated based on estimates at the date of grant using the following weighted-average assumptions: 
Three Months Ended
June 27, 2020June 29, 2019
Risk-free interest rate0.3 %2.1 %
Dividend yield1.7 %1.2 %
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  
Granted127  $84.34  
Vested(144) $78.09  
Cancelled(378) $80.16  
June 27, 20206,385  $80.22