Condensed consolidated guarantor financial information Condensed consolidating statements of income and comprehensive income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Condensed Income Statements, Captions [Line Items]
Net revenues	$ 457,173	$ 413,796	$ 1,363,824	$ 1,245,732
Cost of goods sold	221,007	209,804	662,411	631,730
Gross profit	236,166	203,992	701,413	614,002
Selling, general and administrative expenses	138,252	115,228	425,392	358,431
Research and development expenses	14,871	15,638	43,803	47,169
Restructuring and other impairment charges	1,108	7,084	16,511	29,205
Income from continuing operations before interest, loss on extingushments of debt and taxes	81,935	66,042	215,707	179,197
Interest expense	17,184	13,948	48,650	42,566
Interest income	(161)	(144)	(494)	(458)
Loss on extinguishments of debt	0	1,250	0	1,250
Income from continuing operations before taxes	64,912	50,988	167,551	135,839
Taxes (benefit) on income (loss) from continuing operations	9,684	5,209	28,224	18,958
Equity in net income of consolidated subsidiaries	0	0	0	0
Income from continuing operations	55,228	45,779	139,327	116,881
Operating loss from discontinued operations	(247)	38	(1,866)	(1,746)
Taxes (benefit) on loss from discontinued operations	24	(991)	(345)	(1,547)
Income (loss) from discontinued operations	(271)	1,029	(1,521)	(199)
Net income	54,957	46,808	137,806	116,682
Less: Income from continuing operations attributable to noncontrolling interests	126	234	765	629
Net income attributable to common shareholders	54,831	46,574	137,041	116,053
Other comprehensive loss attributable to common shareholders	(45,201)	24,375	(38,594)	(6,335)
Comprehensive income attributable to common shareholders	9,630	70,949	98,447	109,718
Consolidation, Eliminations
Condensed Income Statements, Captions [Line Items]
Net revenues	(76,256)	(62,407)	(288,398)	(203,291)
Cost of goods sold	(76,817)	(60,522)	(278,691)	(202,927)
Gross profit	561	(1,885)	(9,707)	(364)
Selling, general and administrative expenses	(80)	272	231	66
Research and development expenses	0	0	0	0
Restructuring and other impairment charges	0	0	0	0
Income from continuing operations before interest, loss on extingushments of debt and taxes	641	(2,157)	(9,938)	(430)
Interest expense	0		0	0
Interest income	0	0	0	0
Loss on extinguishments of debt		0		0
Income from continuing operations before taxes	641	(2,157)	(9,938)	(430)
Taxes (benefit) on income (loss) from continuing operations	1,956	(568)	(2,303)	208
Equity in net income of consolidated subsidiaries	(145,578)	(125,134)	(389,054)	(325,136)
Income from continuing operations	(146,893)	(126,723)	(396,689)	(325,774)
Operating loss from discontinued operations	0	0	0	0
Taxes (benefit) on loss from discontinued operations	0	0	0	0
Income (loss) from discontinued operations	0	0	0	0
Net income	(146,893)	(126,723)	(396,689)	(325,774)
Less: Income from continuing operations attributable to noncontrolling interests	0	0	0	0
Net income attributable to common shareholders	(146,893)	(126,723)	(396,689)	(325,774)
Other comprehensive loss attributable to common shareholders	102,385	(51,476)	91,505	9,246
Comprehensive income attributable to common shareholders	(44,508)	(178,199)	(305,184)	(316,528)
Parent Company
Condensed Income Statements, Captions [Line Items]
Net revenues	0	0	0	0
Cost of goods sold	0	0	0	0
Gross profit	0	0	0	0
Selling, general and administrative expenses	8,978	14,088	30,781	45,915
Research and development expenses	0	0	0	0
Restructuring and other impairment charges	0	828	0	828
Income from continuing operations before interest, loss on extingushments of debt and taxes	(8,978)	(14,916)	(30,781)	(46,743)
Interest expense	37,913	33,492	106,794	100,682
Interest income	0	3	0	0
Loss on extinguishments of debt		1,250		1,250
Income from continuing operations before taxes	(46,891)	(49,661)	(137,575)	(148,675)
Taxes (benefit) on income (loss) from continuing operations	(16,761)	(18,446)	(47,891)	(54,192)
Equity in net income of consolidated subsidiaries	85,187	76,448	228,113	210,701
Income from continuing operations	55,057	45,233	138,429	116,218
Operating loss from discontinued operations	(247)	364	(1,866)	(1,788)
Taxes (benefit) on loss from discontinued operations	(21)	(977)	(478)	(1,623)
Income (loss) from discontinued operations	(226)	1,341	(1,388)	(165)
Net income	54,831	46,574	137,041	116,053
Less: Income from continuing operations attributable to noncontrolling interests	0	0	0	0
Net income attributable to common shareholders	54,831	46,574	137,041	116,053
Other comprehensive loss attributable to common shareholders	(45,201)	24,375	(38,594)	(6,335)
Comprehensive income attributable to common shareholders	9,630	70,949	98,447	109,718
Guarantor Subsidiaries
Condensed Income Statements, Captions [Line Items]
Net revenues	261,346	237,949	814,051	740,817
Cost of goods sold	161,298	139,501	489,694	435,937
Gross profit	100,048	98,448	324,357	304,880
Selling, general and administrative expenses	77,352	62,701	235,322	189,193
Research and development expenses	12,871	13,161	37,766	40,250
Restructuring and other impairment charges	148	3,834	8,639	13,112
Income from continuing operations before interest, loss on extingushments of debt and taxes	9,677	18,752	42,630	62,325
Interest expense	(22,346)	(21,204)	(62,993)	(63,348)
Interest income	0	(3)	0	(3)
Loss on extinguishments of debt		0		0
Income from continuing operations before taxes	32,023	39,959	105,623	125,676
Taxes (benefit) on income (loss) from continuing operations	13,984	14,261	44,737	42,241
Equity in net income of consolidated subsidiaries	60,295	48,367	160,653	114,116
Income from continuing operations	78,334	74,065	221,539	197,551
Operating loss from discontinued operations	0	0	0	0
Taxes (benefit) on loss from discontinued operations	0	(170)	0	(170)
Income (loss) from discontinued operations	0	170	0	170
Net income	78,334	74,235	221,539	197,721
Less: Income from continuing operations attributable to noncontrolling interests	0	0	0	0
Net income attributable to common shareholders	78,334	74,235	221,539	197,721
Other comprehensive loss attributable to common shareholders	(58,947)	30,034	(54,326)	(3,316)
Comprehensive income attributable to common shareholders	19,387	104,269	167,213	194,405
Non-Guarantor Subsidiaries
Condensed Income Statements, Captions [Line Items]
Net revenues	272,083	238,254	838,171	708,206
Cost of goods sold	136,526	130,825	451,408	398,720
Gross profit	135,557	107,429	386,763	309,486
Selling, general and administrative expenses	52,002	38,167	159,058	123,257
Research and development expenses	2,000	2,477	6,037	6,919
Restructuring and other impairment charges	960	2,422	7,872	15,265
Income from continuing operations before interest, loss on extingushments of debt and taxes	80,595	64,363	213,796	164,045
Interest expense	1,617	1,660	4,849	5,232
Interest income	(161)	(144)	(494)	(455)
Loss on extinguishments of debt		0		0
Income from continuing operations before taxes	79,139	62,847	209,441	159,268
Taxes (benefit) on income (loss) from continuing operations	10,505	9,962	33,681	30,701
Equity in net income of consolidated subsidiaries	96	319	288	319
Income from continuing operations	68,730	53,204	176,048	128,886
Operating loss from discontinued operations	0	(326)	0	42
Taxes (benefit) on loss from discontinued operations	45	156	133	246
Income (loss) from discontinued operations	(45)	(482)	(133)	(204)
Net income	68,685	52,722	175,915	128,682
Less: Income from continuing operations attributable to noncontrolling interests	126	234	765	629
Net income attributable to common shareholders	68,559	52,488	175,150	128,053
Other comprehensive loss attributable to common shareholders	(43,438)	21,442	(37,179)	(5,930)
Comprehensive income attributable to common shareholders	$ 25,121	$ 73,930	$ 137,971	$ 122,123