Consolidated Statements of Earnings (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 27, 2019	Sep. 28, 2018
Income Statement [Abstract]
Revenues	$ 400,555	$ 415,936	$ 1,233,753	$ 1,246,854
Cost of Goods and Services Sold	193,176	194,477	583,378	573,071
Gross Profit	207,379	221,459	650,375	673,783
Product development	16,723	15,734	50,616	47,135
Selling, marketing and distribution	55,538	57,270	176,796	182,741
General and administrative	31,719	33,676	102,676	104,054
Operating Earnings	103,399	114,779	320,287	339,853
Interest expense	3,618	3,583	10,584	10,707
Other expense, net	2,972	3,139	4,360	8,425
Earnings Before Income Taxes	96,809	108,057	305,343	320,721
Income taxes	12,677	15,376	46,325	53,390
Net Earnings	$ 84,132	$ 92,681	$ 259,018	$ 267,331
Basic earnings per share	$ 0.50	$ 0.55	$ 1.56	$ 1.59
Diluted earnings per share	$ 0.49	$ 0.54	$ 1.51	$ 1.54