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Share Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Share-based Compensation [Abstract]  
Stock Options
The following table summarizes information concerning stock option grants during the first six months of fiscal 2018 and 2017:
 
Fiscal six months ended
 
June 30,
2018
 
July 1,
2017
Stock options granted
664,686

 
1,557,681

Weighted average exercise price
$
67.27

 
$
72.76

Weighted average grant date fair value per option
$
14.86

 
$
14.68
Restricted Stock Units
The following table summarizes information concerning restricted stock unit and performance-based restricted share unit grants during the first six months of fiscal 2018 and 2017:
 
Fiscal six months ended
 
June 30,
2018
 
July 1,
2017
Restricted stock units granted
298,249

 
82,835

Performance-based restricted share units granted
39,330

 
—

Weighted average grant date fair value per share
$
63.37

 
$
66.70