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Stock-Based Compensation Plans (Tables)
 6 Months Ended
Sep. 28, 2019
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
 
Six Months Ended
(In thousands)
September 28, 2019
 
September 29, 2018
 
September 28, 2019
 
September 29, 2018
Stock-based compensation included in:

 
 
 
 
 

Cost of revenues
$
2,812

 
$
2,249

 
$
5,425

 
$
4,284

Research and development
29,702

 
20,047

 
54,576

 
40,977

Selling, general and administrative
17,308

 
12,649

 
32,574

 
25,292

 
$
49,822

 
$
34,945

 
$
92,575

 
$
70,553
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 2020 was $113.02 ($62.79 for the second quarter of fiscal 2019), which were calculated based on estimates at the date of grant using the following weighted-average assumptions: 

 
Three Months Ended
 
Six Months Ended

September 28, 2019
 
September 29, 2018
 
September 28, 2019
 
September 29, 2018
Risk-free interest rate
1.8
%
 
2.7
%
 
1.8
%
 
2.7
%
Dividend yield
1.3
%
 
2.2
%
 
1.3
%
 
2.2
%
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions The fair values of stock purchase plan rights granted in the second quarter of fiscal 2020 and 2019 were estimated using the Black-Scholes option pricing model at the date of grant using the following assumptions:

 
2020
 
2019
Expected life of options (years)
1.25

 
1.25

Expected stock price volatility
0.37

 
0.29

Risk-free interest rate
1.9
%
 
2.5
%
Dividend yield
1.3
%
 
2.0
%
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 Shares
 
Weighted-Average Grant-Date Fair Value Per Share
March 31, 2018
6,989

 
$
51.39

Granted
3,559

 
$
66.94

Vested
(2,681
)
 
$
49.05

Cancelled
(536
)
 
$
55.09

March 30, 2019
7,331

 
$
59.54

Granted
2,556

 
$
111.20

Vested
(2,405
)
 
$
53.40

Cancelled
(172
)
 
$
69.99

September 28, 2019
7,310

 
$
79.38