CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2016	Jun. 28, 2015	Jun. 26, 2016	Jun. 28, 2015
Income Statement [Abstract]
Net revenues	$ 473,553	$ 452,045	$ 898,446	$ 881,475
Cost of goods sold	217,154	218,808	416,900	425,601
Gross profit	256,399	233,237	481,546	455,874
Selling, general and administrative expenses	142,983	142,228	279,331	281,925
Research and development expenses	15,472	13,443	27,825	26,327
Restructuring charges	(119)	580	9,849	5,028
Gain on sale of assets	(378)	0	(1,397)	0
Income from continuing operations before interest and taxes	98,441	76,986	165,938	142,594
Interest expense	11,907	16,207	25,691	33,379
Interest income	(129)	(154)	(209)	(323)
Loss on extinguishment of debt	19,261	10,454	19,261	10,454
Income from continuing operations before taxes	67,402	50,479	121,195	99,084
Taxes on income from continuing operations	8,007	5,280	10,620	14,612
Income from continuing operations	59,395	45,199	110,575	84,472
Operating income (loss) from discontinued operations	6	(145)	(376)	(644)
(Benefit) taxes on loss from discontinued operations	(187)	45	(257)	249
Income (loss) from discontinued operations	193	(190)	(119)	(893)
Net income	59,588	45,009	110,456	83,579
Less: Income from continuing operations attributable to noncontrolling interest	285	446	464	664
Net income attributable to common shareholders	$ 59,303	$ 44,563	$ 109,992	$ 82,915
Basic:
Income from continuing operations (in dollars per share)	$ 1.36	$ 1.08	$ 2.58	$ 2.02
Loss from discontinued operations (in dollars per share)	0.00	(0.01)	0.00	(0.02)
Net income (in dollars per share)	1.36	1.07	2.58	2.00
Diluted:
Income from continuing operations (in dollars per share)	1.25	0.93	2.29	1.76
Loss from discontinued operations (in dollars per share)	0.01	0.00	0.00	(0.02)
Net income (in dollars per share)	1.26	0.93	2.29	1.74
Dividends per share (in dollars per share)	$ 0.34	$ 0.34	$ 0.68	$ 0.68
Weighted average common shares outstanding
Basic (in shares)	43,549	41,560	42,598	41,514
Diluted (in shares)	47,246	48,081	48,014	47,688
Amounts attributable to common shareholders:
Income from continuing operations, net of tax	$ 59,110	$ 44,753	$ 110,111	$ 83,808
Income (loss) from discontinued operations, net of tax	193	(190)	(119)	(893)
Net income attributable to common shareholders	$ 59,303	$ 44,563	$ 109,992	$ 82,915