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.

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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.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Represents the number of shares surrendered during the period by options holders as payment for stock options exercised during the period.

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Shareholders' Equity: (Details 3) (Stock options, USD $)	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Additional disclosures
Compensation expense	$ 1,417,200	$ 1,153,600	$ 930,200
Total unrecognized compensation expense	3,800,000
Weighted average period for recognition of unrecognized compensation expense	2 years 7 months 6 days
Total intrinsic value of options exercised	1,200,000	8,700,000	7,400,000
Total fair value of shares vested	$ 5,100,000	$ 3,900,000	$ 2,800,000
Shares of previously owned common stock surrendered as payment for option shares exercised	0	1,207	31,351
Options Outstanding
Number Outstanding (in shares)		597,700
Weighted Average Remaining Contractual Life		6 years 11 months 5 days
Weighted Average Exercise Price (in dollars per share)		$ 48.50
Options Exercisable
Number Exercisable (in shares)		350,122
Weighted Average Exercise Price (in dollars per share)		$ 36.24
$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		4 years 4 days
Weighted Average Exercise Price (in dollars per share)		$ 13.97
Options Exercisable
Number Exercisable (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)		107,689
Weighted Average Remaining Contractual Life		4 years 3 months 22 days
Weighted Average Exercise Price (in dollars per share)		$ 25.28
Options Exercisable
Number Exercisable (in shares)		107,689
Weighted Average Exercise Price (in dollars per share)		$ 25.28
$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)		132,000
Weighted Average Remaining Contractual Life		6 years 7 months 6 days
Weighted Average Exercise Price (in dollars per share)		$ 40.77
Options Exercisable
Number Exercisable (in shares)		98,309
Weighted Average Exercise Price (in dollars per share)		$ 38.71
$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)		305,750
Weighted Average Remaining Contractual Life		8 years 6 months
Weighted Average Exercise Price (in dollars per share)		$ 65.92
Options Exercisable
Number Exercisable (in shares)		91,863
Weighted Average Exercise Price (in dollars per share)		$ 59.10