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Stock-Based Compensation (Tables) | 6 Months Ended
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Jul. 01, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Weighted-Average Assumptions to Estimated Fair Value of Stock Options Granted | The Company estimated the fair value of the options on the date of grant using the Black-Scholes-Merton model with the following weighted average assumptions:
| 26 Weeks Ended July 1, 2017 |  | 24 Weeks Ended June 18, 2016
Expected market price volatility (1) | 29.3 | % |  | 27.1 | %
Risk-free interest rate (2) | 1.7 | % |  | 1.0 | %
Dividend yield (3) | 1.0 | % |  | 1.4 | %
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.

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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