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Segment Information and Enterprise Reporting Segment Information and Enterprise Reporting - (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 29, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product |  |  |  |  |  |  |  |  | $ 829,874 | $ 738,242 | $ 673,962
Diluted | $ 0.83 | $ 1.02 | $ 0.79 | $ 0.82 | $ (0.15) | $ 0.64 | $ 0.80 | $ 0.93 | $ 3.45 | $ 2.23 | $ 5.85
Percentage Of Product Revenue Based On Geographic Area By Destination |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Long-Lived Assets | $ 297,290 |  |  |  | $ 278,020 |  |  |  | $ 297,290 | $ 278,020 | $ 234,433
Concentration Risk, Long-lived Asset Geographic Area, Percentage | 100.00% |  |  |  | 100.00% |  |  |  | 100.00% | 100.00% | 100.00%
United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product |  |  |  |  |  |  |  |  | $ 566,816 | $ 502,983 | $ 475,068
Europe, Middle East and Africa |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product |  |  |  |  |  |  |  |  | $ 160,910 | $ 138,689 | $ 113,015
Percentage Of Product Revenue Based On Geographic Area By Destination |  |  |  |  |  |  |  |  | 19.40% | 18.80% | 16.80%
Asia and Australia |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product |  |  |  |  |  |  |  |  | $ 75,534 | $ 72,434 | $ 66,136
Percentage Of Product Revenue Based On Geographic Area By Destination |  |  |  |  |  |  |  |  | 9.10% | 9.80% | 9.80%
North and South America (excluding United States) |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product |  |  |  |  |  |  |  |  | $ 26,614 | $ 24,136 | $ 19,743
Percentage Of Product Revenue Based On Geographic Area By Destination |  |  |  |  |  |  |  |  | 3.20% | 3.30% | 2.90%
Reportable Geographical Components | United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 68.30% | 68.10% | 70.50%
Reportable Geographical Components | United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | $ 280,215 |  |  |  | $ 265,678 |  |  |  | $ 280,215 | $ 265,678 | $ 224,540
Concentration Risk, Long-lived Asset Geographic Area, Percentage | 94.30% |  |  |  | 95.60% |  |  |  | 94.30% | 95.60% | 95.80%
Reportable Geographical Components | International |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | $ 17,075 |  |  |  | $ 12,342 |  |  |  | $ 17,075 | $ 12,342 | $ 9,893
Concentration Risk, Long-lived Asset Geographic Area, Percentage | 5.70% |  |  |  | 4.40% |  |  |  | 5.70% | 4.40% | 4.20%

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