Stock Plans (Summary of Stock Option Activity) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	6 Months Ended
	Jul. 04, 2021	Jul. 05, 2020
Stock option activity
Number of Shares, Outstanding at beginning of period	961
Number of Shares, Granted	162
Number of Shares, Exercised	(96)
Number of Shares, Forfeited	(7)
Number of Shares, Outstanding at end of period	1,020
Number of Shares, Exercisable at end of period	640
Weighted-Average Price, Outstanding at beginning of period	$ 74.40
Weighted-Average Price, Granted	134.53
Weighted-Average Price, Exercised	53.98
Weighted-Average Price, Forfeited	88.54
Weighted-Average Price, Outstanding at end of period	85.78
Weighted-Average Price, Exercisable at end of period	$ 72.63
Weighted-Average Remaining Contractual Term in Years, Outstanding at end of period	4 years 3 months 18 days
Weighted-Average Remaining Contractual Term in Years, Exercisable at end of period	3 years 2 months 12 days
Total Intrinsic Value, Outstanding at end of period	$ 46.2
Total Intrinsic Value, Exercisable at end of period	36.7
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation costs capitalized as part of inventory	$ 0.5	$ 0.3