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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Weighted average assumptions used in calculating fair value of stock options
The weighted average of key assumptions used in determining the fair value of options granted and a discussion of the methodology used to develop each assumption are as follows:
 
 
 
2017
 
2016
 
2015
 
 
 
 
 
 
 
Expected term
 
7.7 years

 
6.7 years

 
5.5 years

Expected price volatility
 
28.9
%
 
25.6
%
 
26.2
%
Risk-free interest rate
 
2.1
%
 
1.6
%
 
1.7
%
Dividend yield
 
1.3
%
 
1.0
%
 
0.9
%
Summary of the stock option activity
A summary of the activity and related information follows:

 
 
Stock Options
 
Restricted Stock Awards
 
(Shares in thousands)
 
Shares
 
Weighted Average Exercise Price
 
Shares
 
Weighted Average Grant Date Fair Value
 
 
 
 
 
 
 
 
 
Outstanding at December 31, 2016
 
1,034

 
$
21.24

 
709

 
$
31.02

Granted
 
165

 
31.04

 
209

 
30.97

Exercised
 
(395
)
 
12.10

 
(135
)
 
26.22

Forfeited
 
(10
)
 
26.68

 
(2
)
 
33.13

Equitable Adjustment (1)
 
153

 
 
 
—

 


 
 
 
 
 
 
 
 
 
Outstanding at December 30, 2017
 
947

 
22.31

 
781

 
31.83

(1) Represents the adjustment made in conjunction with the special dividend issued on March 9, 2017 to equalize the intrinsic value of stock options pre- and post-distribution.