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Stock-Based Compensation Plans (Tables)
 6 Months Ended
Sep. 26, 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 EndedSix Months Ended
(In thousands)September 26, 2020September 28, 2019September 26, 2020September 28, 2019
Stock-based compensation included in:
Cost of revenues$2,963 $2,812 $5,684 $5,425 
Research and development36,110 29,702 66,479 54,576 
Selling, general and administrative19,366 17,308 36,659 32,574 
$58,439 $49,822 $108,822 $92,575 
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 second quarter of fiscal 2021 was $95.59 ($113.02 for the second quarter of fiscal 2020), which were calculated based on estimates at the date of grant using the following weighted-average assumptions: 
Three Months EndedSix Months Ended
September 26, 2020September 28, 2019September 26, 2020September 28, 2019
Risk-free interest rate0.3 %1.8 %0.3 %1.8 %
Dividend yield1.5 %1.3 %1.5 %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 
Granted2,968 $95.11 
Vested(2,234)$70.90 
Cancelled(488)$82.66 
September 26, 20207,026 $89.19