CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2016	Sep. 27, 2015	Sep. 25, 2016	Sep. 27, 2015
Income Statement [Abstract]
Net revenues	$ 455,648	$ 443,714	$ 1,354,094	$ 1,325,189
Cost of goods sold	214,046	215,501	630,946	641,102
Gross profit	241,602	228,213	723,148	684,087
Selling, general and administrative expenses	139,797	138,840	419,128	420,765
Research and development expenses	15,067	12,571	42,892	38,898
Restructuring charges	3,027	660	12,876	5,688
Gain on sale of assets	(2,776)	(408)	(4,173)	(408)
Income from continuing operations before interest, extinguishment of debt and taxes	86,487	76,550	252,425	219,144
Interest expense	12,888	14,306	38,579	47,685
Interest income	(115)	(130)	(324)	(453)
Loss on extinguishment of debt	0	0	19,261	10,454
Income from continuing operations before taxes	73,714	62,374	194,909	161,458
Taxes on income from continuing operations	7,514	803	18,134	15,415
Income from continuing operations	66,200	61,571	176,775	146,043
Operating income (loss) from discontinued operations	260	(788)	(116)	(1,432)
(Benefit) taxes on income (loss) from discontinued operations	138	(69)	(119)	180
Income (loss) from discontinued operations	122	(719)	3	(1,612)
Net income	66,322	60,852	176,778	144,431
Less: Income from continuing operations attributable to noncontrolling interest	0	28	464	692
Net income attributable to common shareholders	$ 66,322	$ 60,824	$ 176,314	$ 143,739
Basic:
Income from continuing operations (in dollars per share)	$ 1.50	$ 1.48	$ 4.09	$ 3.50
Loss from discontinued operations (in dollars per share)	0.01	(0.02)	0.00	(0.04)
Net income (in dollars per share)	1.51	1.46	4.09	3.46
Diluted:
Income from continuing operations (in dollars per share)	1.40	1.27	3.69	3.03
Loss from discontinued operations (in dollars per share)	0.00	(0.02)	0.00	(0.03)
Net income (in dollars per share)	1.40	1.25	3.69	3.00
Dividends per share (in dollars per share)	$ 0.34	$ 0.34	$ 1.02	$ 1.02
Weighted average common shares outstanding
Basic (in shares)	44,045	41,597	43,081	41,542
Diluted (in shares)	47,446	48,532	47,824	47,969
Amounts attributable to common shareholders:
Income from continuing operations, net of tax	$ 66,200	$ 61,543	$ 176,311	$ 145,351
Income (loss) from discontinued operations, net of tax	122	(719)	3	(1,612)
Net income attributable to common shareholders	$ 66,322	$ 60,824	$ 176,314	$ 143,739