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		9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Total net revenues	$ 361,895	$ 315,210	$ 1,013,013	$ 961,485
United States [Member]
Segment Reporting Information [Line Items]
Total net revenues	214,755	172,926	564,604	495,717
Americas Excluding United States [Member]
Segment Reporting Information [Line Items]
Total net revenues	5,732	4,721	13,407	13,723
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues	34,094	45,127	116,924	141,731
EMEA Excluding United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues	63,126	59,241	195,788	205,533
APAC [Member]
Segment Reporting Information [Line Items]
Total net revenues	$ 44,188	$ 33,195	$ 122,290	$ 104,781