Consolidated Statements of Earnings (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2020	Jun. 28, 2019	Jun. 26, 2020	Jun. 28, 2019
Income Statement [Abstract]
Revenues	$ 366,892	$ 428,328	$ 740,459	$ 833,198
Cost of Goods and Services Sold	184,363	201,374	359,299	390,202
Gross Profit	182,529	226,954	381,160	442,996
Product development	17,948	17,324	35,029	33,893
Selling, marketing and distribution	48,831	60,441	106,219	121,258
General and administrative	36,015	36,828	70,365	70,957
Impairment	34,962		34,962	0
Operating Earnings	44,773	112,361	134,585	216,888
Interest expense	3,258	3,431	5,744	6,966
Other expense (income), net	(510)	1,119	4,713	1,388
Earnings Before Income Taxes	42,025	107,811	124,128	208,534
Income taxes	13,193	19,674	22,478	33,648
Net Earnings	$ 28,832	$ 88,137	$ 101,650	$ 174,886
Basic earnings per share	$ 0.17	$ 0.53	$ 0.61	$ 1.05
Diluted earnings per share	$ 0.17	$ 0.51	$ 0.59	$ 1.02