Equity Incentive Plans (Tables)

12 Months Ended

Dec. 29, 2019

Share-based Payment Arrangement [Abstract]

Stock Options Activity Related to Equity Incentive Plans

Stock option activity related to the 2004 Equity Incentive Plan is summarized as follows:

	Common Stock Options
	Outstanding			Weighted Average Exercise Price		Weighted Average Remaining Life		Aggregate Intrinsic Value
						(Years)		(In thousands)
Stock options at January 1, 2017		2,498,310		$	43.54
Stock options granted		126,720			201.19
Stock options cancelled		(28,991	)		101.97
Stock options exercised		(357,925	)		17.05
Stock options at December 31, 2017		2,238,114		$	55.94
Stock options granted		96,580			266.11
Stock options cancelled		(11,193	)		174.63
Stock options exercised		(414,102	)		23.74
Stock options at December 30, 2018		1,909,399		$	72.86
Stock options granted		96,280			272.64
Stock options cancelled		(33,667	)		196.47
Stock options exercised		(425,601	)		30.70
Stock options at December 29, 2019		1,546,411		$	94.21		4.4	$	306,340
Exercisable at December 29, 2019		1,350,200		$	71.59		3.8	$	298,015

Stock Option Valuation Assumptions

	2019			2018			2017
Risk-free interest rate		1.9	%		2.7	%		2.0	%
Expected life (years)		5.5			5.5			5.5
Expected volatility		25.0	%		24.2	%		25.8	%
Expected dividend yield		0.9	%		0.8	%		0.9	%
Weighted average fair value per stock option	$	64.66		$	67.65		$	49.57

Resticted Stock and Performance Based Restricted Stock Activity Related to Equity Incentive Plans

Restricted stock and performance-based restricted stock activity related to the 2004 Equity Incentive Plan is summarized as follows:

	Shares			Weighted Average Grant Date Fair Value (1)
Nonvested at January 1, 2017		276,220		$	97.48
Shares granted		72,250			205.21
Shares cancelled		(16,109	)		115.71
Shares vested		(137,757	)		80.55
Nonvested at December 31, 2017		194,604		$	147.94
Shares granted		91,430			271.33
Shares cancelled		(12,692	)		178.06
Shares vested		(82,963	)		128.57
Nonvested at December 30, 2018		190,379		$	213.57
Shares granted		67,570			275.06
Shares cancelled		(17,923	)		230.60
Shares vested		(68,956	)		175.84
Nonvested at December 29, 2019		171,070		$	251.29

(1) The weighted average grant date fair value for performance-based restricted shares granted was calculated based on the market price on the grant dates. Certain tranches will ultimately be valued when the performance condition is established for each tranche, which generally occurs in the fourth quarter of each fiscal year.