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Shareholders' Equity (Deficit): (Tables) | 12 Months Ended
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Dec. 30, 2017
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 27, 2014 |  | 597,700 |  | $ | 48.50 |  | 6.93 |  | $ | 20,973,700
Granted |  | 79,400 |  |  | 91.46 |  |  |  |  |
Exercised |  | (8,360) |  |  | 38.46 |  |  |  |  |
Outstanding, December 26, 2015 |  | 668,740 |  |  | 53.73 |  | 6.41 |  |  | 25,582,300
Granted |  | 69,600 |  |  | 112.07 |  |  |  |  |
Exercised |  | (61,169) |  |  | 26.21 |  |  |  |  |
Forfeited |  | (3,501) |  |  | 80.31 |  |  |  |  |
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
Exercisable, December 30, 2017 |  | 476,780 |  | $ | 58.41 |  | 4.84 |  | $ | 33,845,900
Schedule of weighted average assumptions used in estimation of fair value of options granted |
|  | Year Ended |
|  | December 30, 2017 |  | December 31, 2016 |  | December 26, 2015 |
Risk free interest rate |  |  | 2.05 | % |  | 1.80 | % |  | 1.71 | %
Expected life (years) |  |  | 6 |  |  | 6 |  |  | 6 |
Expected volatility |  |  | 25.64 | % |  | 27.13 | % |  | 30.15 | %
Dividend yield |  |  | 1.10 | % |  | 1.23 | % |  | 1.36 | %
Option fair value |  | $ | 32.07 |  | $ | 28.54 |  | $ | 24.88 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&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 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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