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Shareholders' Equity (Deficit): (Tables) | 9 Months Ended
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Sep. 25, 2021
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 26, 2020 |  | 393,488 | ​ | $ | 113.19 | ​ | 5.61 | ​ | $ | 27,864,900
Granted |  | 34,000 | ​ | ​ | 191.82 | ​ | ​ | ​ | ​ | ​
Exercised |  | (15,329) | ​ | ​ | 84.76 | ​ | ​ | ​ | ​ | ​
Forfeited |  | (2,700) | ​ | ​ | 151.06 | ​ | ​ | ​ | ​ | ​
Outstanding, September 25, 2021 |  | 409,459 | ​ | $ | 120.54 | ​ | 5.29 | ​ | $ | 39,222,800
Exercisable, September 25, 2021 |  | 287,729 | ​ | $ | 99.03 | ​ | 3.93 | ​ | $ | 33,749,500
Schedule of weighted average assumptions used in estimation of fair value of options granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended | ​ | ​
​ |  | September 25, 2021 | ​ | September 26, 2020 | ​ |
Risk free interest rate |  | ​ | 0.90 | % | ​ | 0.40 | % |
Expected life (years) |  | ​ | 6 | ​ | ​ | 6 | ​ |
Expected volatility |  | ​ | 25.07 | % | ​ | 25.03 | % |
Dividend yield |  | ​ | 2.74 | % | ​ | 1.92 | % |
Option fair value | ​ | $ | 32.70 | ​ | $ | 26.55 | ​ | ​

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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=120381028&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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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