Segment Information (Schedule Of Net Revenue By Geographic Areas) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2017	Jul. 03, 2016	Jul. 02, 2017	Jul. 03, 2016
Segment Reporting Information [Line Items]
Total net revenues	$ 330,723	$ 311,655	$ 654,380	$ 621,911
United States [Member]
Segment Reporting Information [Line Items]
Total net revenues	221,387	203,508	427,512	392,874
Americas Excluding United States [Member]
Segment Reporting Information [Line Items]
Total net revenues	5,562	7,400	11,066	11,884
EMEA [Member]
Segment Reporting Information [Line Items]
Total net revenues	55,204	51,653	113,649	116,158
APAC [Member]
Segment Reporting Information [Line Items]
Total net revenues	$ 48,570	$ 49,094	$ 102,153	$ 100,995