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Shareholders' Equity (Deficit): Options Outstanding and Exercisable (Details) - Stock options - USD ($) | 12 Months Ended
--- | ---
Dec. 26, 2015 | Dec. 27, 2014 | Dec. 28, 2013
Options Outstanding |  |  |
Number Outstanding (in shares) | 668,740 |  |
Weighted Average Remaining Contractual Life | 6 years 4 months 28 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 53.73 |  |
Options Exercisable |  |  |
Exercisable at the end of the period (in shares) | 440,577 |  |
Weighted Average Exercise Price (in dollars per share) | $ 41.76 |  |
Additional disclosures |  |  |
Total intrinsic value of options exercised | $ 400,000 | $ 1,200,000 | $ 8,700,000
Total fair value of shares vested | $ 6,200,000 | $ 5,100,000 | $ 3,900,000
Shares of previously owned common stock surrendered as payment for option shares exercised | 587 | 0 | 1,207
Compensation expense | $ 1,694,800 | $ 1,417,200 | $ 1,153,600
Total unrecognized compensation expense | $ 4,000,000 |  |
Weighted average period for recognition of unrecognized compensation expense | 2 years 6 months |  |
$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) | 52,261 |  |
Weighted Average Remaining Contractual Life | 3 years 11 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 13.97 |  |
Options Exercisable |  |  |
Exercisable at the end of the period (in shares) | 52,261 |  |
Weighted Average Exercise Price (in dollars per share) | $ 13.97 |  |
$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) | 104,674 |  |
Weighted Average Remaining Contractual Life | 3 years 4 months 6 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 25.20 |  |
Options Exercisable |  |  |
Exercisable at the end of the period (in shares) | 104,674 |  |
Weighted Average Exercise Price (in dollars per share) | $ 25.20 |  |
$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) | 128,519 |  |
Weighted Average Remaining Contractual Life | 5 years 7 months 6 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 40.82 |  |
Options Exercisable |  |  |
Exercisable at the end of the period (in shares) | 117,203 |  |
Weighted Average Exercise Price (in dollars per share) | $ 39.82 |  |
$53.34 - $80.32 |  |  |
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) | $ 80.32 |  |
Options Outstanding |  |  |
Number Outstanding (in shares) | 256,136 |  |
Weighted Average Remaining Contractual Life | 7 years 5 months 16 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 62.87 |  |
Options Exercisable |  |  |
Exercisable at the end of the period (in shares) | 142,564 |  |
Weighted Average Exercise Price (in dollars per share) | $ 58.85 |  |
$82.72 - $91.93 |  |  |
Stock options outstanding and exercisable |  |  |
Range of Exercise Price, low end of range (in dollars per share) | 82.72 |  |
Range of Exercise Price, high end of range (in dollars per share) | $ 91.93 |  |
Options Outstanding |  |  |
Number Outstanding (in shares) | 127,150 |  |
Weighted Average Remaining Contractual Life | 9 years 4 days |  |
Weighted Average Exercise Price (in dollars per share) | $ 88.18 |  |
Options Exercisable |  |  |
Exercisable at the end of the period (in shares) | 23,875 |  |
Weighted Average Exercise Price (in dollars per share) | $ 82.72 |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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