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Shareholders' Equity: (Tables) | 12 Months Ended
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Dec. 27, 2014
Shareholders' Equity: |
Schedule of stock option activity under the 2001 Plan, 2010 Plan and Nonemployee Directors Plan |
|  | Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (years) |  | Intrinsic Value |
Outstanding at December 31, 2011 |  | 668,614 |  | $ | 24.31 |  | 6.62 |  | $ | 22,101,800 |
Granted |  | 120,000 |  | 54.26 |  |  |  |  |
Exercised |  | (174,887 | ) | 19.77 |  |  |  |  |
Outstanding at December 29, 2012 |  | 613,727 |  | 31.46 |  | 7.06 |  | 16,010,000 |
Granted |  | 96,250 |  | 71.39 |  |  |  |  |
Exercised |  | (176,700 | ) | 18.82 |  |  |  |  |
Forfeited |  | (6,565 | ) | 42.20 |  |  |  |  |
Outstanding at December 28, 2013 |  | 526,712 |  | 42.87 |  | 7.33 |  | 26,446,700 |
Granted |  | 97,000 |  | 73.31 |  |  |  |  |
Exercised |  | (21,012 | ) | 19.89 |  |  |  |  |
Forfeited |  | (5,000 | ) | 56.85 |  |  |  |  |
Outstanding at December 27, 2014 |  | 597,700 |  | $ | 48.50 |  | 6.93 |  | $ | 20,973,700 |
Exercisable at December 27, 2014 |  | 350,122 |  | $ | 36.24 |  | 5.74 |  | $ | 16,580,000 |
Schedule of weighted average assumptions used in estimation of fair value of options granted |
|  | Year Ended |
|  | December 27, 2014 |  | December 28, 2013 |  | December 29, 2012 |
Risk free interest rate |  | 1.75 | % | 1.60 | % | .88 | %
Expected life (years) |  | 6 |  | 6 |  | 6 |
Expected volatility |  | 33.2 | % | 32.9 | % | 31.9 | %
Dividend yield |  | 1.66 | % | 1.65 | % | 2.05 | %
Fair value per option granted |  | $ | 21.02 |  | $ | 20.36 |  | $ | 13.43 |
Schedule of options outstanding and options exercisable |
|  | Options Outstanding |  | Options Exercisable |
Range of Exercise Price |  | Number Outstanding |  | Weighted Average Remaining Contractual Life (Years) |  | Weighted Average Exercise Price |  | Number Exercisable |  | Weighted Average Exercise Price |
$ 12.75 - $ 18.40 |  | 52,261 |  | 4.01 |  | $ | 13.97 |  | 52,261 |  | $ | 13.97 |
20.32 - 31.19 |  | 107,689 |  | 4.31 |  | 25.28 |  | 107,689 |  | 25.28 |
32.92 - 51.17 |  | 132,000 |  | 6.60 |  | 40.77 |  | 98,309 |  | 38.71 |
53.34 - 82.72 |  | 305,750 |  | 8.50 |  | 65.92 |  | 91,863 |  | 59.10 |
|  | 597,700 |  | 6.93 |  | $ | 48.50 |  | 350,122 |  | $ | 36.24 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&loc=d3e5070-113901 + Details
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