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Revenue Recognition - Schedule of New Accounting Pronouncements and Changes in Accounting Principles (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Revenue
Revenue	$ 384,567	$ 325,341	$ 296,250	$ 292,707	$ 332,058	$ 200,413	$ 208,227	$ 202,681	$ 1,298,865	$ 943,379	$ 740,739
Costs and expenses
Cost of revenue	273,161	238,512	234,994	226,275	247,554	130,234	123,922	120,513	972,942	622,223	496,739
Net loss	(66,594)	(84,767)	(113,656)	(121,601)	(133,467)	(32,610)	(21,938)	(26,280)	$ (386,618)	$ (214,295)	$ (194,506)
Net loss per share - basic and diluted (in dollars per share)									$ (2.16)	$ (1.36)	$ (1.32)
Balances Without Adoption of ASC 606
Revenue
Revenue										$ 936,645
Costs and expenses
Cost of revenue										623,910
Net loss										$ (222,716)
Net loss per share - basic and diluted (in dollars per share)										$ (1.41)
Accounting Standards Update 2014-09 \| Adjustments
Revenue
Revenue										$ (6,734)
Costs and expenses
Cost of revenue										1,687
Net loss										$ (8,421)
Net loss per share - basic and diluted (in dollars per share)										$ (0.05)
Product
Revenue
Revenue	307,861	253,754	226,866	223,007	249,608	167,030	175,288	171,629	$ 1,011,488	$ 763,555	$ 610,535
Product \| Balances Without Adoption of ASC 606
Revenue
Revenue										752,875
Product \| Accounting Standards Update 2014-09 \| Adjustments
Revenue
Revenue										(10,680)
Services
Revenue
Revenue	$ 76,706	$ 71,587	$ 69,384	$ 69,700	$ 82,450	$ 33,383	$ 32,939	$ 31,052	$ 287,377	179,824	$ 130,204
Services \| Balances Without Adoption of ASC 606
Revenue
Revenue										183,770
Services \| Accounting Standards Update 2014-09 \| Adjustments
Revenue
Revenue										$ 3,946