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Shareholders' Equity: (Details 3) (Stock options, USD $) | 12 Months Ended
--- | ---
Dec. 28, 2013 | Dec. 29, 2012 | Dec. 31, 2011
Options Outstanding |  |  |
Number Outstanding (in shares) | 526,712 |  |
Weighted Average Remaining Contractual Life | 7 years 3 months 29 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 42.87 |  |
Options Exercisable |  |  |
Number Exercisable (in shares) | 273,887 |  |
Weighted Average Exercise Price (in dollars per share) | $ 29.65 |  |
Additional disclosures |  |  |
Total intrinsic value of options exercised | $ 8,700,000 | $ 7,400,000 | $ 1,800,000
Total fair value of shares vested | 3,900,000 | 2,800,000 | 2,200,000
Shares of previously owned common stock surrendered as payment for option shares exercised | 1,207 | 31,351 | 2,208
Compensation expense | 1,153,600 | 930,200 | 755,700
Total unrecognized compensation expense | $ 3,400,000 |  |
Weighted average period for recognition of unrecognized compensation expense | 2 years 7 months 6 days |  |
$12.75 - $18.40 |  |  |
Stock options outstanding and exercisable |  |  |
Range of Exercise Price, low end of range (in dollars per share) | $ 12.75 |  |
Range of Exercise Price, high end of range (in dollars per share) | $ 18.40 |  |
Options Outstanding |  |  |
Number Outstanding (in shares) | 64,636 |  |
Weighted Average Remaining Contractual Life | 5 years 14 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 13.84 |  |
Options Exercisable |  |  |
Number Exercisable (in shares) | 64,636 |  |
Weighted Average Exercise Price (in dollars per share) | $ 13.84 |  |
$20.32 - $31.19 |  |  |
Stock options outstanding and exercisable |  |  |
Range of Exercise Price, low end of range (in dollars per share) | $ 20.32 |  |
Range of Exercise Price, high end of range (in dollars per share) | $ 31.19 |  |
Options Outstanding |  |  |
Number Outstanding (in shares) | 115,326 |  |
Weighted Average Remaining Contractual Life | 5 years 3 months 22 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 25.37 |  |
Options Exercisable |  |  |
Number Exercisable (in shares) | 103,449 |  |
Weighted Average Exercise Price (in dollars per share) | $ 24.70 |  |
$32.92 - $51.17 |  |  |
Stock options outstanding and exercisable |  |  |
Range of Exercise Price, low end of range (in dollars per share) | $ 32.92 |  |
Range of Exercise Price, high end of range (in dollars per share) | $ 51.17 |  |
Options Outstanding |  |  |
Number Outstanding (in shares) | 134,250 |  |
Weighted Average Remaining Contractual Life | 7 years 7 months 6 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 40.80 |  |
Options Exercisable |  |  |
Number Exercisable (in shares) | 65,618 |  |
Weighted Average Exercise Price (in dollars per share) | $ 37.72 |  |
$53.34 - $82.72 |  |  |
Stock options outstanding and exercisable |  |  |
Range of Exercise Price, low end of range (in dollars per share) | $ 53.34 |  |
Range of Exercise Price, high end of range (in dollars per share) | $ 82.72 |  |
Options Outstanding |  |  |
Number Outstanding (in shares) | 212,500 |  |
Weighted Average Remaining Contractual Life | 8 years 11 months 16 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 62.51 |  |
Options Exercisable |  |  |
Number Exercisable (in shares) | 40,184 |  |
Weighted Average Exercise Price (in dollars per share) | $ 54.65 |  |

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