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. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011
Segment Reporting Information [Line Items]
Total net revenues	$ 315,210	$ 301,800	$ 961,485	$ 871,863
United States [Member]
Segment Reporting Information [Line Items]
Total net revenues	172,926	144,969	495,717	419,460
Americas Excluding United States [Member]
Segment Reporting Information [Line Items]
Total net revenues	4,721	4,040	13,723	11,022
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues	45,127	38,010	141,731	124,831
EMEA Excluding United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues	59,241	81,725	205,533	227,855
APAC [Member]
Segment Reporting Information [Line Items]
Total net revenues	$ 33,195	$ 33,056	$ 104,781	$ 88,695