Shareholders' Equity: (Tables)

9 Months Ended

Sep. 28, 2013

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 29, 2012	613,727		$	31.46	7.06	$	16,010,000
Granted	47,500		59.77
Exercised	(168,462	)	18.72
Forfeited	(6,565	)	42.20
Outstanding at September 28, 2013	486,200		$	38.50	7.28	$	17,358,000
Exercisable at September 28, 2013	236,064		$	27.15	6.07	$	11,107,300

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

	Nine Months Ended
	September 28, 2013			September 29, 2012
Risk free interest rate	1.30		%	0.88		%
Expected life (years)	6			6
Expected volatility	32.5		%	31.4		%
Dividend yield	1.90		%	2.06		%
Option fair value	$	15.84		$	12.95