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Stock-Based Compensation Plans (Tables)
 3 Months Ended
Jun. 30, 2018
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 30, 2018
 
July 1, 2017
Stock-based compensation included in:

 

Cost of revenues
$
2,035

 
$
2,150

Research and development
20,930

 
17,466

Selling, general and administrative
12,643

 
12,420

 
$
35,608

 
$
32,036
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 2019 was $65.69 ($57.99 for the first quarter of fiscal 2018), which were calculated based on estimates at the date of grant using the following weighted-average assumptions: 

 
Three Months Ended

June 30, 2018

July 1, 2017
Risk-free interest rate
2.7
%
 
1.7
%
Dividend yield
2.1
%
 
2.3
%
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 Shares
 
Weighted-Average Grant-Date Fair Value Per Share
April 1, 2017
6,988

 
$
42.93

Granted
3,718

 
$
60.18

Vested
(3,016
)
 
$
43.30

Cancelled
(701
)
 
$
48.16

March 31, 2018
6,989

 
$
51.39

Granted
261

 
$
65.69

Vested
(212
)
 
$
53.68

Cancelled
(128
)
 
$
50.50

June 30, 2018
6,910

 
$
51.84