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Shareholders' Equity (Tables)
 6 Months Ended
Jun. 29, 2018
Equity [Abstract]  
Summary Of Stock-Based Compensation Expense, Net Of Tax
The following table summarizes stock-based compensation expense for the second quarter and first two quarters of fiscal 2018 and 2017:
 
Second Quarter of
 
First Two Quarters of
 
2018
 
2017
 
2018
 
2017
(In millions)
 
 
 
 
 
 
 
Cost of sales
$
1.1

 
$
0.9

 
$
2.2

 
$
1.7

Research and development
3.2

 
2.6

 
6.3

 
5.0

Sales and marketing
2.4

 
2.4

 
4.7

 
4.6

General and administrative
10.2

 
9.3

 
21.1

 
17.6

Total operating expense
15.8

 
14.3

 
32.1

 
27.2

Total stock-based compensation expense
$
16.9

 
$
15.2

 
$
34.3

 
$
28.9