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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
The per share weighted-average fair value of RSUs granted during fiscal 2018, 2017 and 2016 were $60.18, $44.38 and $41.19, respectively. The weighted average fair value of RSUs granted in fiscal 2018, 2017 and 2016 were calculated based on estimates at the date of grant using the following weighted-average assumptions: 

Fiscal 2018
 
Fiscal 2017
 
Fiscal 2016
Risk-free interest rate
1.8
%
 
0.9
%
 
1.3
%
Dividend yield
2.2
%
 
2.8
%
 
2.8
%
Shares available for grant under stock option plan
A summary of shares available for grant under the 2007 Equity Plan is as follows:
(Shares in thousands)
 
Shares Available for Grant
March 28, 2015
 
15,373

Stock options cancelled
 
10

RSUs granted
 
(3,088
)
RSUs cancelled
 
651

April 2, 2016
 
12,946

Additional shares reserved
 
2,500

Stock options cancelled
 
1

RSUs granted
 
(3,398
)
RSUs cancelled
 
410

April 1, 2017
 
12,459

Additional shares reserved
 
1,900

RSUs granted
 
(3,718
)
RSUs cancelled
 
701

March 31, 2018
 
11,342
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 and intrinsic value in thousands)
Number of Shares

Weighted-Average Grant-Date Fair Value Per Share

Weighted Average Remaining Contractual Term (Years)

Aggregate Intrinsic Value (1)
March 28, 2015
6,873

 
$39.07
 
 
 
 
Granted
3,088

 
$41.19
 
 
 
 
Vested (2)
(2,691
)
 
$37.23
 
 
 
 
Cancelled
(651
)
 
$39.77
 
 
 
 
April 2, 2016
6,619

 
$40.74
 
 
 
 
Granted
3,398

 
$44.38
 
 
 
 
Vested (2)
(2,619
)
 
$39.49
 
 
 
 
Cancelled
(410
)
 
$41.63
 
 
 
 
April 1, 2017
6,988

 
$42.93
 
 
 
 
Granted
3,718

 
$60.18
 
 
 
 
Vested (2)
(3,016
)
 
$43.30
 
 
 
 
Cancelled
(701
)
 
$48.16
 
 
 
 
March 31, 2018
6,989

 
$51.39
 
2.37
 
$
504,733




 

 

 


Expected to vest as of March 31, 2018
5,585

 
$51.46
 
2.36
 
$
403,490



(1)
Aggregate intrinsic value for RSUs represents the closing price per share of Xilinx's stock on March 31, 2018 of $72.24, multiplied by the number of RSUs outstanding or expected to vest as of March 31, 2018.

(2)
The number of RSUs vested includes shares that the Company withheld on behalf of employees to satisfy the statutory tax withholding requirements.
Employee stock purchase plan, valuation assumptions
These fair values per share were estimated at the date of grant using the following weighted-average assumptions:
 
Employee Stock Purchase Plan
 
Fiscal 2018
 
Fiscal 2017
 
Fiscal 2016
Expected life of options (years)
1.3

 
1.3

 
1.3

Expected stock price volatility
0.29

 
0.24

 
0.26

Risk-free interest rate
1.6
%
 
0.7
%
 
0.5
%
Dividend yield
2.1
%
 
2.4
%
 
2.7
%
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 Amended and Restated 1990 Employee Qualified Stock Purchase Plan (ESPP):
 
Years Ended
(In thousands)
March 31, 2018
 
April 1, 2017
 
April 2, 2016
Stock-based compensation included in:

 

 

Cost of revenues
$
8,492

 
$
8,014

 
$
7,977

Research and development
76,790

 
66,822

 
59,692

Selling, general and administrative
51,912

 
48,022

 
44,315

Executive transition costs
16,621

 
—

 
—

Stock-based compensation effect on income before taxes
153,815

 
122,858

 
111,984

Income tax effect
(40,188
)
 
(37,752
)
 
(34,119
)
Net stock-based compensation effect on net income
$
113,627

 
$
85,106

 
$
77,865