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Stock-Based Compensation Plans (Tables)
 6 Months Ended
Sep. 26, 2015
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 26, 2015
 
September 27, 2014
 
September 26, 2015
 
September 27, 2014
Stock-based compensation included in:

 

 

 

Cost of revenues
$
1,763

 
$
2,077

 
$
3,727

 
$
4,069

Research and development
12,934

 
14,831

 
27,626

 
25,336

Selling, general and administrative
11,984

 
11,832

 
21,648

 
21,441

 
$
26,681

 
$
28,740

 
$
53,001

 
$
50,846
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
The per share weighted-average fair value of RSUs granted during the second quarter of fiscal 2016 was $41.07 ($44.40 for the second quarter of fiscal 2015), and for the first six months of fiscal 2016 was $41.13 ($43.84 for the first six months of fiscal 2015), which were calculated based on estimates at the date of grant using the following weighted-average assumptions: 
 
Three Months Ended
 
Six Months Ended

September 26, 2015
 
September 27, 2014
 
September 26, 2015
 
September 27, 2014
Risk-free interest rate
1.3
%
 
0.7
%
 
1.3
%
 
0.7
%
Dividend yield
2.8
%
 
2.4
%
 
2.8
%
 
2.4
%
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]
The fair values of stock purchase plan rights granted in the second quarter of fiscal 2016 and 2015 were estimated using the Black-Scholes option pricing model at the date of grant using the following assumptions:

2016
 
2015
Expected life of options (years)
1.25

 
1.25

Expected stock price volatility
0.25

 
0.25

Risk-free interest rate
0.4
%
 
0.2
%
Dividend yield
3.0
%
 
2.8
%
Employee Stock Option [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of option plans activity
A summary of the Company’s option plans activity and related information is as follows:
 
 
Options Outstanding
(Shares in thousands)
Number of Shares
 
Weighted-Average Exercise Price Per Share
March 29, 2014
5,280

 
$
25.22

Exercised
(2,009
)
 
$
25.80

Forfeited/cancelled/expired
(24
)
 
$
32.22

March 28, 2015
3,247

 
$
24.81

Exercised
(1,159
)
 
$
24.64

Forfeited/cancelled/expired
(12
)
 
$
31.99

September 26, 2015
2,076

 
$
24.86

Options exercisable at:

 

September 26, 2015
2,039

 
$
24.69

March 28, 2015
3,173

 
$
24.59
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 29, 2014
6,901

 
$
35.08

Granted
3,201

 
$
43.11

Vested
(2,698
)
 
$
33.82

Cancelled
(531
)
 
$
32.91

March 28, 2015
6,873

 
$
39.07

Granted
2,754

 
$
41.13

Vested
(2,178
)
 
$
37.18

Cancelled
(399
)
 
$
39.63

September 26, 2015
7,050

 
$
40.42