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Segment Information and Enterprise Reporting Long-lived assets by geographic area (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 02, 2021
Sep. 26, 2020
Oct. 02, 2021
Sep. 26, 2020
Jan. 02, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]          
Long-Lived Assets $ 276,415   $ 276,415   $ 273,849
Concentration Risk, Long-lived Asset Geographic Area, Percentage 100.00%   100.00%   100.00%
Product $ 307,413 $ 278,112 $ 911,574 $ 848,690  
Concentration Risk, Percentage 100.00% 100.00% 100.00% 100.00%  
United States (U.S.) | Geographic Concentration Risk | Revenue Benchmark          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Concentration Risk, Percentage 67.40% 67.20% 67.30% 67.30%  
EMEA [Member] | Geographic Concentration Risk | Revenue Benchmark          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Concentration Risk, Percentage 18.30% 19.50% 19.40% 20.80%  
Asia Pacific [Member] | Geographic Concentration Risk | Revenue Benchmark          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Concentration Risk, Percentage 11.30% 9.90% 10.30% 8.60%  
North and South America (excluding the U.S.) | Geographic Concentration Risk | Revenue Benchmark          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Concentration Risk, Percentage 3.00% 3.40% 3.00% 3.30%  
Reportable Geographical Components | United States (U.S.)          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Long-Lived Assets $ 239,435   $ 239,435   $ 238,094
Concentration Risk, Long-lived Asset Geographic Area, Percentage 86.60%   86.60%   86.90%
Product $ 207,060 $ 186,919 $ 613,197 $ 571,158  
Reportable Geographical Components | International          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Long-Lived Assets $ 36,980   $ 36,980   $ 35,755
Concentration Risk, Long-lived Asset Geographic Area, Percentage 13.40%   13.40%   13.10%
Reportable Geographical Components | EMEA [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Product $ 56,223 54,257 $ 177,053 176,781  
Reportable Geographical Components | Asia Pacific [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Product 34,878 27,583 94,134 73,155  
Reportable Geographical Components | North and South America (excluding the U.S.)          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Product $ 9,252 $ 9,353 $ 27,190 $ 27,596