Segment Information and Operations By Geographic Area (Schedule Of Net Revenue By Geography Periods) (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2016	Mar. 29, 2015
Segment Reporting Information [Line Items]
Total net revenues	$ 310,256	$ 309,157
United States [Member]
Segment Reporting Information [Line Items]
Total net revenues	189,366	170,592
Americas Excluding United States [Member]
Segment Reporting Information [Line Items]
Total net revenues	4,484	3,194
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues	11,540	31,365
EMEA Excluding United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues	52,965	57,744
AUSTRALIA
Segment Reporting Information [Line Items]
Total net revenues	31,134	29,653
Asia Pacific excluding Australia [Member]
Segment Reporting Information [Line Items]
Total net revenues	$ 20,767	$ 16,609