Consolidated Statements of Earnings (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2018	Sep. 29, 2017	Sep. 28, 2018	Sep. 29, 2017
Income Statement [Abstract]
Revenues	$ 415,936	$ 379,812	$ 1,246,854	$ 1,099,885
Cost of Goods and Services Sold	194,477	175,732	573,071	505,450
Gross Profit	221,459	204,080	673,783	594,435
Product development	15,734	14,552	47,135	43,473
Selling, marketing and distribution	57,270	57,381	182,741	167,353
General and administrative	33,676	30,712	104,054	94,329
Operating Earnings	114,779	101,435	339,853	289,280
Interest expense	3,583	3,901	10,707	12,110
Other expense, net	3,139	1,142	8,425	3,599
Earnings Before Income Taxes	108,057	96,392	320,721	273,571
Income taxes	15,376	20,932	53,390	57,551
Net Earnings	$ 92,681	$ 75,460	$ 267,331	$ 216,020
Basic earnings per share	$ 0.55	$ 0.45	$ 1.59	$ 1.29
Diluted earnings per share	$ 0.54	$ 0.43	$ 1.54	$ 1.24