CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net revenues	$ 567,034	$ 652,507	$ 1,197,676	$ 1,266,091
Cost of goods sold	288,662	300,269	585,680	589,883
Gross profit	278,372	352,238	611,996	676,208
Selling, general and administrative expenses	191,193	215,500	338,989	422,421
Research and development expenses	29,364	27,595	56,760	54,745
Restructuring and impairment charges	19,005	1,685	20,351	19,080
Gain on sale of assets	0	0	0	(2,739)
Income from continuing operations before interest and taxes	38,810	107,458	195,896	182,701
Interest expense	15,682	20,758	31,121	43,450
Interest income	(163)	(472)	(742)	(811)
Income from continuing operations before taxes	23,291	87,172	165,517	140,062
Taxes on income from continuing operations	11,848	3,844	22,922	14,816
Income from continuing operations	11,443	83,328	142,595	125,246
Operating income (loss) from discontinued operations	22	61	18	(1,282)
Tax benefit (expense) on operating loss from discontinued operations	9	14	7	(308)
Income (loss) from discontinued operations	13	47	11	(974)
Net income	$ 11,456	$ 83,375	$ 142,606	$ 124,272
Basic:
Income from continuing operations (in dollars per share)	$ 0.25	$ 1.80	$ 3.07	$ 2.72
Income (loss) from discontinued operations (in dollars per share)	0	0.01	0	(0.02)
Net income (in dollars per share)	0.25	1.81	3.07	2.70
Diluted:
Income from continuing operations (in dollars per share)	0.24	1.77	3.02	2.67
Loss from discontinued operations (in dollars per share)	0	0	0	(0.03)
Net income (in dollars per share)	$ 0.24	$ 1.77	$ 3.02	$ 2.64
Weighted average common shares outstanding
Basic (in shares)	46,442	46,172	46,412	46,111
Diluted (in shares)	47,242	47,036	47,237	46,989