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. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Total net revenues	$ 337,604	$ 357,719	$ 686,995	$ 651,118
United States [Member]
Segment Reporting Information [Line Items]
Total net revenues	182,222	196,136	372,498	349,849
Americas Excluding United States [Member]
Segment Reporting Information [Line Items]
Total net revenues	5,312	4,712	9,815	7,675
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues	42,574	41,972	83,774	82,830
EMEA Excluding United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues	57,862	66,395	123,455	132,662
APAC [Member]
Segment Reporting Information [Line Items]
Total net revenues	$ 49,634	$ 48,504	$ 97,453	$ 78,102