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Share-Based Awards (Tables) | 9 Months Ended
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Sep. 25, 2015
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract] |
Employee Stock Option Activity | Options on common shares granted and outstanding, as well as the weighted average exercise price, are shown below (in thousands, except exercise prices):
| Option Shares |  | Weighted Average Exercise Price |  | Options Exercisable |  | Weighted Average Exercise Price
Outstanding, December 26, 2014 | 4,975 |  |  | $ | 44.72 |  |  | 3,318 |  |  | $ | 34.86 |
Granted | 543 |  |  | 74.19 |  |  |  |  |
Exercised | (171 | ) |  | 34.57 |  |  |  |  |
Canceled | (17 | ) |  | 72.14 |  |  |  |  |
Outstanding, September 25, 2015 | 5,330 |  |  | $ | 47.96 |  |  | 3,739 |  |  | $ | 38.55 |
Black Scholes Option Pricing Inputs | The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions and results:
| Thirty-nine Weeks Ended
| Sep 25, 2015 |  | Sep 26, 2014
Expected life in years | 6.5 |  |  | 6.5 |
Interest rate | 1.7 | % |  | 2.0 | %
Volatility | 35.0 | % |  | 36.1 | %
Dividend yield | 1.6 | % |  | 1.5 | %
Weighted average fair value per share | $ | 23.18 |  |  | $ | 24.83 |
Fair Value of Employee Purchase Rights | The benefit of the 15 percent discount from the lesser of the fair market value per common share on the first day and the last day of the plan year was added to the fair value of the employees’ purchase rights determined using the Black-Scholes option-pricing model with the following assumptions and results:
| Thirty-nine Weeks Ended
| Sep 25, 2015 |  | Sep 26, 2014
Expected life in years | 1.0 |  |  | 1.0 |
Interest rate | 0.2 | % |  | 0.1 | %
Volatility | 18.9 | % |  | 21.4 | %
Dividend yield | 1.6 | % |  | 1.4 | %
Weighted average fair value per share | $ | 16.51 |  |  | $ | 17.81 |
Shares Authorized | Shares authorized for issuance under stock option and purchase plans are shown below (in thousands):
| Total Shares Authorized |  | Available for Future Issuance as of Sep 25, 2015
Stock Incentive Plan (2015) | 3,500 |  |  | 3,452 |
Employee Stock Purchase Plan (2006) | 7,000 |  |  | 4,928 |
Total | 10,500 |  |  | 8,380 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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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 employee stock purchase plans, including, but not limited to: (a) expected term, (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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