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Share Based Compensation (Tables)
 9 Months Ended
Sep. 29, 2018
Share-based Compensation [Abstract]  
Stock Options
The following table summarizes information concerning stock option grants during the first nine months of fiscal 2018 and 2017:
 
Fiscal nine months ended
 
September 29,
2018
 
September 30,
2017
Stock options granted
691,086

 
1,619,280

Weighted average exercise price
$
67.72

 
$
72.16

Weighted average grant date fair value per option
$
14.99

 
$
14.57
Restricted Stock Units
The following table summarizes information concerning restricted stock unit and performance-based restricted share unit grants during the first nine months of fiscal 2018 and 2017:
 
Fiscal nine months ended
 
September 29,
2018
 
September 30,
2017
Restricted stock units granted
306,338

 
85,049

Performance-based restricted share units granted
41,310

 
—

Weighted average grant date fair value per share
$
63.73

 
$
66.34