Schedule Of Net Revenue By Geography Periods (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jul. 01, 2012	Apr. 01, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Total net revenues	$ 356,620	$ 361,895	$ 357,719	$ 293,399	$ 310,436	$ 315,210	$ 320,655	$ 325,620	$ 1,369,633	$ 1,271,921	$ 1,181,018
United States [Member]
Segment Reporting Information [Line Items]
Total net revenues									769,357	660,998	570,143
Americas Excluding United States [Member]
Segment Reporting Information [Line Items]
Total net revenues									19,961	18,421	16,913
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues									142,729	184,404	165,522
EMEA Excluding United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues									269,959	273,320	312,191
APAC [Member]
Segment Reporting Information [Line Items]
Total net revenues									$ 167,627	$ 134,778	$ 116,249