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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 18, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Weighted-Average Assumptions to Estimated Fair Value of Stock Options Granted
The estimated weighted average fair value for each option granted during the 24 weeks ended June 18, 2016 and June 20, 2015 was $3.32 and $6.37, respectively, with the following weighted average assumptions:
 
24 Weeks Ended
 
June 18,
2016
 
June 20,
2015
Expected market price volatility (1)
27.1
%
 
28.8
%
Risk-free interest rate (2)
1.0
%
 
1.3
%
Dividend yield (3)
1.4
%
 
0.9
%
Expected term (4)
4 years

 
4 years

(1) 
Based on historical volatility of the Company’s common stock. The expected volatility is based on the daily percentage change in the price of the stock over the four years prior to the grant.
(2) 
Represents the U.S. Treasury yield curve in effect for the expected term of the option at the time of grant.
(3) 
Represents the Company’s estimated cash dividend yield for the expected term.
(4) 
Represents the period of time that options granted are expected to be outstanding. As part of the determination of the expected term, the Company concluded that all employee groups exhibit similar exercise and post-vesting termination behavior.