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Share-Based Compensation (Tables)
 9 Months Ended
Oct. 29, 2017
Share-based Compensation [Abstract]  
Allocation Of Stock-Based Compensation
The following table summarizes pre-tax share-based compensation included in the Statements of Income for the three and nine months ended October 29, 2017 and October 30, 2016.
 
Three Months Ended
 
Nine Months Ended
(in thousands)
October 29, 2017
 
October 30, 2016
 
October 29, 2017
 
October 30, 2016
Revenue offset
$
6,249

 
$
3,669

 
$
14,726

 
$
3,669

Cost of sales
316

 
360

 
1,161

 
1,108

Selling, general and administrative
6,589

 
3,965

 
22,200

 
12,001

Product development and engineering
2,202

 
1,401

 
6,079

 
4,420

Share-based compensation
$
15,356

 
$
9,395

 
$
44,166

 
$
21,198

Net change in share-based compensation capitalized into inventory
$
—

 
$
124

 
$
(414
)
 
$
106