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Stock-Based Compensation Plans (Tables)
 9 Months Ended
Dec. 27, 2014
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
 
Nine Months Ended
(In thousands)
December 27, 2014
 
December 28, 2013
 
December 27, 2014
 
December 28, 2013
Stock-based compensation included in:

 

 

 

Cost of revenues
$
2,339

 
$
1,966

 
$
6,408

 
$
5,628

Research and development
14,909

 
11,912

 
40,245

 
33,474

Selling, general and administrative
11,806

 
10,461

 
33,247

 
29,251

 
$
29,054

 
$
24,339

 
$
79,900

 
$
68,353
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 third quarter of fiscal 2015 was $40.76 ($42.37 for the third quarter of fiscal 2014), and for the first nine months of fiscal 2015 was $43.76 ($38.13 for the first nine months of fiscal 2014), which were calculated based on estimates at the date of grant using the following weighted-average assumptions: 
 
Three Months Ended
 
Nine Months Ended

December 27, 2014
 
December 28, 2013
 
December 27, 2014
 
December 28, 2013
Risk-free interest rate
1.3
%
 
0.7
%
 
0.7
%
 
0.7
%
Dividend yield
2.7
%
 
2.2
%
 
2.4
%
 
2.5
%
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 2015 and 2014 were estimated at the date of grant using the following assumptions:

2015
 
2014
Expected life of options (years)
1.25

 
1.25

Expected stock price volatility
0.25

 
0.23

Risk-free interest rate
0.2
%
 
0.2
%
Dividend yield
2.8
%
 
2.1
%
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 30, 2013
12,753

 
$
28.01

Granted
8

 
$
41.08

Exercised
(7,421
)
 
$
29.95

Forfeited/cancelled/expired
(60
)
 
$
35.61

March 29, 2014
5,280

 
$
25.22

Granted
—

 
$
—

Exercised
(1,417
)
 
$
26.03

Forfeited/cancelled/expired
(16
)
 
$
32.85

December 27, 2014
3,847

 
$
24.89

Options exercisable at:

 

December 27, 2014
3,750

 
$
24.64

March 29, 2014
4,935

 
$
24.87
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 30, 2013
5,996

 
$
30.83

Granted
3,297

 
$
38.90

Vested
(2,066
)
 
$
29.25

Cancelled
(326
)
 
$
32.28

March 29, 2014
6,901

 
$
35.08

Granted
2,754

 
$
43.76

Vested
(2,264
)
 
$
33.62

Cancelled
(292
)
 
$
36.45

December 27, 2014
7,099

 
$
38.86