Segment Information and Operations By Geographic Area (Schedule Of Net Revenue By Geography Periods) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Segment Reporting Information [Line Items]
Total net revenues	$ 288,782	$ 337,604	$ 597,939	$ 686,995
United States [Member]
Segment Reporting Information [Line Items]
Total net revenues	168,282	182,222	338,874	372,498
Americas Excluding United States [Member]
Segment Reporting Information [Line Items]
Total net revenues	4,177	5,312	7,371	9,815
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues	21,750	42,574	53,115	83,774
EMEA Excluding United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues	46,243	57,862	103,987	123,455
AUSTRALIA
Segment Reporting Information [Line Items]
Total net revenues	31,008	33,473	60,661	63,873
APAC Excluding Australia [Member]
Segment Reporting Information [Line Items]
Total net revenues	$ 17,322	$ 16,161	$ 33,931	$ 33,580