CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 02, 2017	Mar. 27, 2016
Income Statement [Abstract]
Net revenues	$ 487,881	$ 424,893
Cost of goods sold	232,321	199,746
Gross profit	255,560	225,147
Selling, general and administrative expenses	163,969	136,348
Research and development expenses	17,827	12,353
Restructuring charges	12,945	9,968
Gain on sale of assets	0	(1,019)
Income from continuing operations before interest, loss on extinguishment of debt and taxes	60,819	67,497
Interest expense	17,726	13,784
Interest income	(169)	(80)
Loss on extinguishment of debt	5,582	0
Income from continuing operations before taxes	37,680	53,793
(Benefit) taxes on income from continuing operations	(2,669)	2,613
Income from continuing operations	40,349	51,180
Operating loss from discontinued operations	(282)	(382)
Benefit on loss from discontinued operations	(103)	(70)
Loss from discontinued operations	(179)	(312)
Net income	40,170	50,868
Less: Income from continuing operations attributable to noncontrolling interest	0	179
Net income attributable to common shareholders	$ 40,170	$ 50,689
Basic:
Income from continuing operations (in dollars per share)	$ 0.90	$ 1.22
Loss from discontinued operations (in dollars per share)	(0.01)	0.00
Net income (in dollars per share)	0.89	1.22
Diluted:
Income from continuing operations (in dollars per share)	0.87	1.05
Loss from discontinued operations (in dollars per share)	(0.01)	(0.01)
Net income (in dollars per share)	0.86	1.04
Dividends per share (in dollars per share)	$ 0.34	$ 0.34
Weighted average common shares outstanding
Basic (in shares)	44,893	41,647
Diluted (in shares)	46,615	48,782
Amounts attributable to common shareholders:
Income from continuing operations, net of tax	$ 40,349	$ 51,001
Income (loss) from discontinued operations, net of tax	(179)	(312)
Net income attributable to common shareholders	$ 40,170	$ 50,689