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Shareholders' Equity (Deficit): (Tables)

12 Months Ended

Dec. 30, 2017

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 27, 2014		597,700		$	48.50		6.93		$	20,973,700
Granted		79,400			91.46
Exercised		(8,360)			38.46
Outstanding, December 26, 2015		668,740			53.73		6.41			25,582,300
Granted		69,600			112.07
Exercised		(61,169)			26.21
Forfeited		(3,501)			80.31
Outstanding, December 31, 2016		673,670			62.11		6.11			43,139,100
Granted		69,500			128.00
Exercised		(80,236)			33.41
Forfeited		(4,750)			95.28
Outstanding, December 30, 2017		658,184		$	72.33		5.87		$	37,723,800
Exercisable, December 30, 2017		476,780		$	58.41		4.84		$	33,845,900

Schedule of weighted average assumptions used in estimation of fair value of options granted

		Year Ended
		December 30, 2017			December 31, 2016			December 26, 2015
Risk free interest rate			2.05	%		1.80	%		1.71	%
Expected life (years)			6			6			6
Expected volatility			25.64	%		27.13	%		30.15	%
Dividend yield			1.10	%		1.23	%		1.36	%
Option fair value		$	32.07		$	28.54		$	24.88

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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=96867065&loc=d3e5070-113901

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