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Stock-Based Compensation (Tables) | 12 Months Ended
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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.

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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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