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Employee Benefits (Tables) | 12 Months Ended
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Dec. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock Options Activity Related to Equity Incentive Plans | Stock option activity related to the 2004 Equity Incentive Plan is summarized as follows:
|  | Common Stock Options |
|  | Outstanding |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Life |  |  | Aggregate Intrinsic Value |
|  |  |  |  |  |  |  | (Years) |  |  | (In thousands) |
Stock options at January 3, 2016 |  |  | 3,323,476 |  |  | $ | 28.57 |  |  |  |  |  |  |  |  |
Stock options granted |  |  | 233,280 |  |  |  | 129.42 |  |  |  |  |  |  |  |  |
Stock options cancelled |  |  | (12,798 | ) |  |  | 104.23 |  |  |  |  |  |  |  |  |
Stock options exercised |  |  | (1,045,648 | ) |  |  | 14.38 |  |  |  |  |  |  |  |  |
Stock options at January 1, 2017 |  |  | 2,498,310 |  |  | $ | 43.54 |  |  |  |  |  |  |  |  |
Stock options granted |  |  | 126,720 |  |  |  | 201.19 |  |  |  |  |  |  |  |  |
Stock options cancelled |  |  | (28,991 | ) |  |  | 101.97 |  |  |  |  |  |  |  |  |
Stock options exercised |  |  | (357,925 | ) |  |  | 17.05 |  |  |  |  |  |  |  |  |
Stock options at December 31, 2017 |  |  | 2,238,114 |  |  | $ | 55.94 |  |  |  |  |  |  |  |  |
Stock options granted |  |  | 96,580 |  |  |  | 266.11 |  |  |  |  |  |  |  |  |
Stock options cancelled |  |  | (11,193 | ) |  |  | 174.63 |  |  |  |  |  |  |  |  |
Stock options exercised |  |  | (414,102 | ) |  |  | 23.74 |  |  |  |  |  |  |  |  |
Stock options at December 30, 2018 |  |  | 1,909,399 |  |  | $ | 72.86 |  |  |  | 4.5 |  |  | $ | 340,555 |
Exercisable at December 30, 2018 |  |  | 1,698,583 |  |  | $ | 56.40 |  |  |  | 4.0 |  |  | $ | 328,788 |
Stock Options Valuation Assumptions |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Risk-free interest rate |  |  | 2.7 | % |  |  | 2.0 | % |  |  | 1.3 | %
Expected life (years) |  |  | 5.5 |  |  |  | 5.5 |  |  |  | 5.5 |
Expected volatility |  |  | 24.2 | % |  |  | 25.8 | % |  |  | 26.0 | %
Expected dividend yield |  |  | 0.8 | % |  |  | 0.9 | % |  |  | 1.2 | %
Weighted average fair value per stock option |  | $ | 67.65 |  |  | $ | 49.57 |  |  | $ | 29.59 |
Restricted Stock and Performance Based Restricted Stock Activity Related to Equity Incentive Plans | Restricted stock and performance-based restricted stock activity related to the 2004 Equity Incentive Plan is summarized as follows:
|  | Shares |  |  | Weighted Average Grant Date Fair Value |
Nonvested at January 3, 2016 |  |  | 316,332 |  |  | $ | 75.74 |
Shares granted (1) |  |  | 97,650 |  |  |  | 131.75 |
Shares cancelled |  |  | (13,970 | ) |  |  | 88.34 |
Shares vested |  |  | (123,792 | ) |  |  | 70.39 |
Nonvested at January 1, 2017 |  |  | 276,220 |  |  | $ | 97.48 |
Shares granted (1) |  |  | 72,250 |  |  |  | 205.21 |
Shares cancelled |  |  | (16,109 | ) |  |  | 115.71 |
Shares vested |  |  | (137,757 | ) |  |  | 80.55 |
Nonvested at December 31, 2017 |  |  | 194,604 |  |  | $ | 147.94 |
Shares granted (1) |  |  | 91,430 |  |  |  | 271.33 |
Shares cancelled |  |  | (12,692 | ) |  |  | 178.06 |
Shares vested |  |  | (82,963 | ) |  |  | 128.57 |
Nonvested at December 30, 2018 |  |  | 190,379 |  |  | $ | 213.57 |
(1) | The weighted average grant date fair value for performance-based restricted shares granted was calculated based on the market price on the grant dates. Certain tranches will ultimately be valued when the performance condition is established for each tranche, which generally occurs in the fourth quarter of each fiscal year.

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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=109197908&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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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