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Share Based Compensation (Tables) | 12 Months Ended
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Dec. 30, 2017
Share-based Compensation [Abstract] |
Key assumptions in fair value determination | The ranges of key assumptions used in determining the fair value of options granted during fiscal 2017, 2016 and 2015, as well as a summary of the methodology applied to develop each assumption, are as follows:
| Fiscal Year
| 2017 |  | 2016 |  | 2015
Expected price volatility | 25.1 - 26.0% |  |  | 25.5 - 27.9% |  |  | 27.3 – 28.8%
Risk-free interest rate | 1.7 - 1.9% |  |  | 0.9 - 1.3% |  |  | 1.2 – 1.5%
Weighted average expected lives (in years) | 4.4 |  |  | 4.4 |  |  | 4.5
Forfeiture rate | 7.2 | % |  | 7.1 | % |  | 6.9%
Dividend yield | 1.3 | % |  | 0.9 | % |  | 1.0%
Summary of stock option activity | A summary of stock option activity is as follows:
| Options |  | Weighted Average Exercise Price |  | Weighted Average Fair Value |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value (in thousands)
Outstanding December 27, 2014 | 4,083,426 |  |  | $ | 41.93 |  |  |  |  |  | 7.2 |  | $ | 146,967 |
Granted | 1,080,490 |  |  | 83.70 |  |  | $ | 19.53 |  |  |  |  |
Exercised | (1,116,828 | ) |  | 33.11 |  |  |  |  |  |  |
Canceled | (185,582 | ) |  | 67.28 |  |  |  |  |  |  |
Outstanding December 26, 2015 | 3,861,506 |  |  | $ | 54.95 |  |  |  |  | 7.1 |  | $ | 119,050 |
Granted | 1,150,941 |  |  | 86.05 |  |  | $ | 19.27 |  |  |  |  |
Exercised | (851,118 | ) |  | 42.53 |  |  |  |  |  |  |
Canceled | (187,582 | ) |  | 80.01 |  |  |  |  |  |  |
Outstanding December 31, 2016 | 3,973,747 |  |  | $ | 65.43 |  |  |  |  | 6.9 |  | $ | 59,601 |
Granted | 1,625,140 |  |  | 72.11 |  |  | $ | 14.56 |  |  |  |  |
Exercised | (309,904 | ) |  | 38.87 |  |  |  |  |  |  |
Canceled | (290,457 | ) |  | 79.08 |  |  |  |  |  |  |
Outstanding December 30, 2017 | 4,998,526 |  |  | $ | 68.46 |  |  |  |  | 6.9 |  | $ | 50,145 |
Exercisable at December 30, 2017 | 2,582,283 |  |  | $ | 60.46 |  |  |  |  | 5.3 |  | $ | 45,939 |
Other information relative to option activity | Other information relative to option activity during fiscal 2017, 2016 and 2015 is as follows (in thousands):
| 2017 |  | 2016 |  | 2015
Total fair value of stock options vested | $ | 15,996 |  |  | $ | 15,184 |  |  | $ | 13,207 |
Total intrinsic value of stock options exercised | $ | 9,237 |  |  | $ | 39,696 |  |  | $ | 60,082 |
Restricted stock units activity | The status of restricted stock units is presented below:
Restricted Stock Units |  | Shares |  | Weighted Average Grant Date Fair Value
Restricted at December 27, 2014 |  | 277,347 |  |  | $ | 42.64 |
Granted |  | 56,052 |  |  | 84.86 |
Exercised |  | (107,548 | ) |  | 25.97 |
Forfeited |  | (6,234 | ) |  | 63.57 |
Restricted at December 26, 2015 |  | 219,617 |  |  | $ | 60.99 |
Granted |  | 59,586 |  |  | 83.22 |
Exercised |  | (58,503 | ) |  | 52.51 |
Forfeited |  | (26,669 | ) |  | 76.51 |
Restricted at December 31, 2016 |  | 194,031 |  |  | $ | 68.04 |
Granted |  | 85,049 |  |  | 66.34 |
Exercised |  | (51,069 | ) |  | 64.64 |
Forfeited |  | (4,781 | ) |  | 79.65 |
Restricted at December 30, 2017 |  | 223,230 |  |  | $ | 67.92 |
Other information relative to restricted unit activity | Other information relative to restricted stock unit activity during fiscal 2017, 2016 and 2015 is as follows (in thousands):
| 2017 |  | 2016 |  | 2015
Total grant date fair value of restricted stock units vested and issued | $ | 3,301 |  |  | $ | 3,072 |  |  | $ | 2,793 |
Total intrinsic value of restricted stock units vested and issued | $ | 3,465 |  |  | $ | 5,104 |  |  | $ | 9,139 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 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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