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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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