Segment Information, Operations By Geographic Area And Customer Concentration (Schedule Of Net Revenue By Geography Periods) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Segment Reporting Information [Line Items]
Total net revenues	$ 357,719	$ 320,655	$ 651,118	$ 646,275
United States [Member]
Segment Reporting Information [Line Items]
Total net revenues	196,136	158,046	349,849	322,791
Americas Excluding United States [Member]
Segment Reporting Information [Line Items]
Total net revenues	4,712	5,392	7,675	9,002
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues	41,972	47,210	82,830	96,604
EMEA Excluding United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues	66,395	70,605	132,662	146,292
APAC [Member]
Segment Reporting Information [Line Items]
Total net revenues	$ 48,504	$ 39,402	$ 78,102	$ 71,586