Segment Information (Schedule Of Net Revenue By Geographic Areas) (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2017	Apr. 03, 2016
Segment Reporting Information [Line Items]
Total net revenues	$ 323,657	$ 310,256
United States [Member]
Segment Reporting Information [Line Items]
Total net revenues	206,125	189,366
Americas Excluding United States [Member]
Segment Reporting Information [Line Items]
Total net revenues	5,504	4,484
EMEA [Member]
Segment Reporting Information [Line Items]
Total net revenues	58,445	64,505
Australia [Member]
Segment Reporting Information [Line Items]
Total net revenues	33,481	31,134
APAC Excluding Australia [Member]
Segment Reporting Information [Line Items]
Total net revenues	$ 20,102	$ 20,767