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Shareholders' Equity (Deficit): (Tables) | 12 Months Ended
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Dec. 28, 2019
Shareholders' Equity (Deficit): |
Schedule of stock option activity |
|  |  |  |  |  |  | Weighted Average |  |  |
|  |  |  |  |  |  | Remaining |  |  |
|  | Number of |  | Weighted Average |  | Contractual Life |  |  |
|  | Shares |  | Exercise Price |  | (years) |  | Intrinsic Value
Outstanding, December 31, 2016 |  | 673,670 |  | $ | 62.11 |  | 6.11 |  | $ | 43,139,100
Granted |  | 69,500 |  |  | 128.00 |  |  |  |  |
Exercised |  | (80,236) |  |  | 33.41 |  |  |  |  |
Forfeited |  | (4,750) |  |  | 95.28 |  |  |  |  |
Outstanding, December 30, 2017 |  | 658,184 |  |  | 72.33 |  | 5.87 |  |  | 37,723,800
Granted |  | 69,000 |  |  | 149.51 |  |  |  |  |
Exercised |  | (79,241) |  |  | 39.37 |  |  |  |  |
Forfeited |  | (8,563) |  |  | 119.24 |  |  |  |  |
Outstanding, December 29, 2018 |  | 639,380 |  |  | 84.12 |  | 5.61 |  |  | 47,808,100
Granted |  | 54,800 |  |  | 170.14 |  |  |  |  |
Exercised |  | (190,172) |  |  | 57.41 |  |  |  |  |
Forfeited |  | (24,450) |  |  | 138.13 |  |  |  |  |
Outstanding, December 28, 2019 |  | 479,558 |  | $ | 101.78 |  | 5.79 |  | $ | 45,283,200
Exercisable, December 28, 2019 |  | 344,108 |  | $ | 83.08 |  | 4.69 |  | $ | 38,930,300
Schedule of weighted average assumptions used in estimation of fair value of options granted |
|  | Year Ended |
|  | December 28, 2019 |  | December 29, 2018 |  | December 30, 2017 |
Risk free interest rate |  |  | 1.85 | % |  | 2.73 | % |  | 2.05 | %
Expected life (years) |  |  | 6 |  |  | 6 |  |  | 6 |
Expected volatility |  |  | 19.30 | % |  | 19.94 | % |  | 25.64 | %
Dividend yield |  |  | 1.38 | % |  | 1.13 | % |  | 1.10 | %
Option fair value |  | $ | 30.96 |  | $ | 32.45 |  | $ | 32.07 |

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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=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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