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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 26, 2020
Share-based Payment Arrangement [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:
|  | 2020 |  | 2019 |  | 2018
Fair value of stock options on grant date |  | $ | 6.81 |  | $ | 8.78 |  | $ | 9.64
Expected term |  | 7.9 years |  | 7.8 years |  | 7.6 years
Expected price volatility |  | 31.9 | % |  | 28.6 | % |  | 27.2 | %
Risk-free interest rate |  | 0.6 | % |  | 2.4 | % |  | 2.9 | %
Dividend yield |  | 1.7 | % |  | 1.4 | % |  | 1.3 | %
Summary of the stock option activity | A summary of the activity and related information follows:
|  | Stock Options |  | Restricted Stock Awards |  | Performance Stock Awards
(Shares in thousands) |  | Shares |  | Weighted Average Exercise Price |  | Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value
Beginning of period |  | 939 |  |  | $ | 25.05 |  |  | 764 |  |  | $ | 31.44 |  |  | $ | 298 |  |  | $ | 31.08 |
Granted |  | 28 |  |  | 24.33 |  |  | 120 |  |  | 29.00 |  |  | 197 |  |  | 29.61 |
Exercised/Released |  | (158) |  |  | 15.55 |  |  | (176) |  |  | 31.93 |  |  | — |  |  | — |
Forfeited |  | (16) |  |  | 31.63 |  |  | (2) |  |  | 32.36 |  |  | — |  |  | — |
End of period |  | 793 |  |  | $ | 26.81 |  |  | 706 |  |  | $ | 30.89 |  |  | 495 |  |  | $ | 30.50 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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