CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Sep. 25, 2016	Oct. 01, 2017	Sep. 25, 2016
Income Statement [Abstract]
Net revenues	$ 534,703	$ 455,648	$ 1,551,197	$ 1,354,094
Cost of goods sold	239,476	214,046	710,126	630,946
Gross profit	295,227	241,602	841,071	723,148
Selling, general and administrative expenses	163,771	139,797	486,674	419,128
Research and development expenses	21,194	15,067	59,299	42,892
Restructuring (credits) charges	(92)	3,027	13,723	12,876
Gain on sale of assets	0	(2,776)	0	(4,173)
Income from continuing operations before interest, loss on extinguishment of debt and taxes	110,354	86,487	281,375	252,425
Interest expense	21,264	12,888	58,884	38,579
Interest income	(286)	(115)	(616)	(324)
Loss on extinguishment of debt	0	0	5,593	19,261
Income from continuing operations before taxes	89,376	73,714	217,514	194,909
Taxes on income from continuing operations	9,978	7,514	19,404	18,134
Income from continuing operations	79,398	66,200	198,110	176,775
Operating (loss) income from discontinued operations	(3,749)	260	(4,597)	(116)
(Benefit) taxes on income (loss) from discontinued operations	(1,366)	138	(1,675)	(119)
(Loss) income from discontinued operations	(2,383)	122	(2,922)	3
Net income	77,015	66,322	195,188	176,778
Less: Income from continuing operations attributable to noncontrolling interest	0	0	0	464
Net income attributable to common shareholders	$ 77,015	$ 66,322	$ 195,188	$ 176,314
Basic:
Income from continuing operations (in dollars per share)	$ 1.76	$ 1.50	$ 4.40	$ 4.09
Income (loss) from discontinued operations (in dollars per share)	(0.05)	0.01	(0.06)	0.00
Net income (in dollars per share)	1.71	1.51	4.34	4.09
Diluted:
Income from continuing operations (in dollars per share)	1.70	1.40	4.24	3.69
Loss from discontinued operations (in dollars per share)	(0.05)	0.00	(0.06)	0.00
Net income (in dollars per share)	1.65	1.40	4.18	3.69
Dividends per share (in dollars per share)	$ 0.34	$ 0.34	$ 1.02	$ 1.02
Weighted average common shares outstanding
Basic (in shares)	45,035	44,045	44,975	43,081
Diluted (in shares)	46,587	47,446	46,673	47,824
Amounts attributable to common shareholders:
Income from continuing operations, net of tax	$ 79,398	$ 66,200	$ 198,110	$ 176,311
(Loss) income from discontinued operations, net of tax	(2,383)	122	(2,922)	3
Net income attributable to common shareholders	$ 77,015	$ 66,322	$ 195,188	$ 176,314