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Segment Information (Schedule Of Net Revenue By Geographic Region) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jul. 01, 2018
Apr. 01, 2018
Dec. 31, 2017
Oct. 01, 2017
Jul. 02, 2017
Apr. 02, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]                      
Net revenue $ 288,928 $ 269,411 $ 255,276 $ 245,201 $ 274,149 $ 251,950 $ 251,685 $ 261,385 $ 1,058,816 $ 1,039,169 [1] $ 1,143,445 [1]
United States (U.S.)                      
Segment Reporting Information [Line Items]                      
Net revenue                 686,145 648,152 713,178
Americas (excluding U.S.)                      
Segment Reporting Information [Line Items]                      
Net revenue                 14,548 16,937 21,802
EMEA                      
Segment Reporting Information [Line Items]                      
Net revenue                 207,599 197,074 [1] 217,554 [1]
APAC                      
Segment Reporting Information [Line Items]                      
Net revenue                 $ 150,524 $ 177,006 $ 190,911
[1] Prior period amounts have not been adjusted to conform with ASC 606 as the Company adopted ASC 606 under the modified retrospective method.