Condensed Consolidated Statements Of Equity (USD $) In Thousands	Total	Common stock	Additional paid-in capital	Retained deficit	Foreign currency translation adjustments [Member]	Defined benefit pension adjustments [Member]
Balance at Dec. 31, 2011	$ 608,238	$ 1,358	$ 788,673	$ (225,766)	$ 44,737	$ (764)
Balance (in shares) at Dec. 31, 2011		135,821
Shares issued under stock plans (in shares)		1,743
Shares issued under stock plans	4,689	18	4,671	0	0	0
Repurchase and retirement of common stock (shares)		(57)
Repurchase and retirement of common stock	(427)	(1)	(329)	(97)	0	0
Share-based compensation expense	8,030	0	8,030	0	0	0
Tax benefit associated with stock plans	1,337	0	1,337	0	0	0
Pension liability adjustments, net of tax	8	0	0	0	0	8
Reclassification of cumulative translation adjustment associated with liquidated subsidiary	0
Reclassification of foreign currency translation associated with acquisition of business	(216)	0	0	0	(216)	0
Foreign currency translation	3,729	0	0	0	3,729	0
Net income	57,569	0	0	57,569	0	0
Balance at Sep. 29, 2012	682,957	1,375	802,382	(168,294)	48,250	(756)
Balance (in shares) at Sep. 29, 2012		137,507
Balance at Dec. 31, 2012	694,799	1,385	809,514	(157,038)	41,997	(1,059)
Balance (in shares) at Dec. 31, 2012		138,458
Shares issued under stock plans (in shares)		1,748
Shares issued under stock plans	6,667	17	6,650	0	0	0
Repurchase and retirement of common stock (shares)		(1,539)
Repurchase and retirement of common stock	(14,826)	(15)	(8,998)	(5,813)	0	0
Share-based compensation expense	5,859	0	5,859	0	0	0
Tax benefit associated with stock plans	1,125	0	1,125	0	0	0
Pension liability adjustments, net of tax	52	0	0	0	0	52
Reclassification of cumulative translation adjustment associated with liquidated subsidiary	739	0	0	0	739	0
Foreign currency translation	(14,314)	0	0	0	(14,314)	0
Net income	53,985	0	0	53,985		0
Balance at Sep. 28, 2013	$ 734,086	$ 1,387	$ 814,150	$ (108,866)	$ 28,422	$ (1,007)
Balance (in shares) at Sep. 28, 2013		138,667