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
	Mar. 30, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Total net revenues	$ 349,391	$ 293,399
United States [Member]
Segment Reporting Information [Line Items]
Total net revenues	190,276	153,713
Americas Excluding United States [Member]
Segment Reporting Information [Line Items]
Total net revenues	4,503	2,963
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues	41,200	40,858
EMEA Excluding United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues	65,593	66,267
APAC [Member]
Segment Reporting Information [Line Items]
Total net revenues	$ 47,819	$ 29,598