Supplemental Guarantor Information (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011
Condensed Consolidated Statements of Operations and Comprehensive Income [Abstract]
Revenues	$ 484,042	$ 536,251	$ 948,333	$ 997,879
Cost of sales	(332,121)	(379,637)	(654,694)	(710,810)
Gross profit	151,921	156,614	293,639	287,069
Income from equity method investment	1,960	3,855	4,701	7,717
Selling, general and administrative expenses	(77,931)	(84,380)	(161,157)	(159,316)
Operating income	58,351	58,212	102,316	100,285
Research and development	(15,029)	(14,530)	(29,062)	(28,159)
Interest income	211	156	562	315
Amortization of intangibles	(2,570)	(3,347)	(5,805)	(7,026)
Income (loss) from continuing operations before taxes	46,060	45,620	78,455	76,044
Interest expense	(12,502)	(12,748)	(24,423)	(24,556)
Income (loss) from continuing operations	42,390	34,881	66,665	56,899
Loss from discontinued operations, net of tax		(156)		(284)
Net income (loss)	42,390	34,725	66,665	56,615
Comprehensive income (loss)	14,152	42,326	49,053	86,973
Income tax expense	(3,670)	(10,739)	(11,790)	(19,145)
Issuer [Member]
Condensed Consolidated Statements of Operations and Comprehensive Income [Abstract]
Revenues	272,477	281,225	531,744	521,349
Cost of sales	(194,020)	(212,163)	(379,405)	(388,902)
Gross profit	78,457	69,062	152,339	132,447
Selling, general and administrative expenses	(44,014)	(44,251)	(90,937)	(83,818)
Operating income	29,795	21,151	51,994	41,339
Research and development	(3,495)	(2,840)	(7,078)	(5,650)
Interest income	14	29	38	72
Intercompany income (expense)	(942)	(13,004)	(1,911)	(14,686)
Amortization of intangibles	(1,153)	(820)	(2,330)	(1,640)
Income (loss) from equity investment in subsidiaries	31,720	39,679	49,959	55,653
Income (loss) from continuing operations before taxes	48,853	35,693	76,442	58,434
Interest expense	(11,734)	(12,162)	(23,638)	(23,944)
Income (loss) from continuing operations		34,881		56,899
Loss from discontinued operations, net of tax		(156)		(284)
Net income (loss)	42,390	34,725	66,665	56,615
Comprehensive income (loss)	42,308	35,321	64,939	57,211
Income tax expense	(6,463)	(812)	(9,777)	(1,535)
Non-Guarantor Subsidiaries [Member]
Condensed Consolidated Statements of Operations and Comprehensive Income [Abstract]
Revenues	271,689	302,918	534,408	571,565
Cost of sales	(198,225)	(215,366)	(393,108)	(416,943)
Gross profit	73,464	87,552	141,300	154,622
Income from equity method investment	1,960	3,855	4,701	7,717
Selling, general and administrative expenses	(33,917)	(40,129)	(70,220)	(75,498)
Operating income	28,556	37,061	50,322	58,946
Research and development	(11,534)	(11,690)	(21,984)	(22,509)
Interest income	197	127	524	243
Intercompany income (expense)	942	13,004	1,911	14,686
Amortization of intangibles	(1,417)	(2,527)	(3,475)	(5,386)
Income (loss) from continuing operations before taxes	28,927	49,606	51,972	73,263
Interest expense	(768)	(586)	(785)	(612)
Income (loss) from continuing operations		39,679		55,653
Net income (loss)	31,720	39,679	49,959	55,653
Comprehensive income (loss)	3,564	46,684	34,073	85,415
Income tax expense	2,793	(9,927)	(2,013)	(17,610)
Eliminations [Member]
Condensed Consolidated Statements of Operations and Comprehensive Income [Abstract]
Revenues	(60,124)	(47,892)	(117,819)	(95,035)
Cost of sales	60,124	47,892	117,819	95,035
Income (loss) from equity investment in subsidiaries	(31,720)	(39,679)	(49,959)	(55,653)
Income (loss) from continuing operations before taxes	(31,720)	(39,679)	(49,959)	(55,653)
Income (loss) from continuing operations		(39,679)		(55,653)
Net income (loss)	(31,720)	(39,679)	(49,959)	(55,653)
Comprehensive income (loss)	$ (31,720)	$ (39,679)	$ (49,959)	$ (55,653)