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Shareholders' Equity (Deficit): (Tables) | 12 Months Ended
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Dec. 26, 2020
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 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
Granted |  | 45,100 | ​ | ​ | 163.87 | ​ | ​ | ​ | ​ | ​
Exercised |  | (108,170) | ​ | ​ | 76.29 | ​ | ​ | ​ | ​ | ​
Forfeited |  | (23,000) | ​ | ​ | 148.16 | ​ | ​ | ​ | ​ | ​
Outstanding, December 26, 2020 |  | 393,488 | ​ | $ | 113.19 | ​ | 5.61 | ​ | $ | 27,864,900
Exercisable, December 26, 2020 |  | 280,908 | ​ | $ | 94.80 | ​ | 4.39 | ​ | $ | 25,059,600
Schedule of weighted average assumptions used in estimation of fair value of options granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended |
​ |  | December 26, 2020 | ​ | December 28, 2019 |  | December 29, 2018 |
Risk free interest rate |  | ​ | 0.45 | % | ​ | 1.85 | % | ​ | 2.73 | %
Expected life (years) |  | ​ | 6 | ​ | ​ | 6 | ​ | ​ | 6 | ​
Expected volatility |  | ​ | 25.03 | % | ​ | 19.30 | % | ​ | 19.94 | %
Dividend yield |  | ​ | 2.33 | % | ​ | 1.38 | % | ​ | 1.13 | %
Option fair value | ​ | $ | 28.25 | ​ | $ | 30.96 | ​ | $ | 32.45 | ​

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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=120381028&loc=d3e5070-113901 + Details
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