Income Taxes - Narrative (Details) - USD ($) $ 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	Dec. 31, 2016
Income Tax [Line Items]
Loss from international operations									$ 202,200	$ 135,500	$ 22,600
Provision for/(benefit) from income taxes	$ (163)	$ 1,548	$ 1,385	$ 193	$ 12	$ 135	$ (124)	$ (678)	$ 2,963	$ (655)	$ (1,430)
Effective tax rate									(0.80%)	0.30%	0.70%
Federal statutory rate									21.00%	21.00%	35.00%
Cumulative unrecognized tax benefit	44,092				24,617				$ 44,092	$ 24,617	$ 19,786	$ 22,282
Unrecognized tax benefits netted against deferred tax assets									40,800
Unrecognized tax benefits impact effective tax rate	3,100								3,100
Unrecognized tax benefits	800								800
Additions									$ 18,212	2,981	0
Percentage of R&D credit not sustained									100.00%
Accrued interest or penalties related to unrecognized tax benefits	1,400				$ 1,200				$ 1,400	$ 1,200	$ 700
Scientific Research and Experimental Development (SRED) Credits
Income Tax [Line Items]
Tax credit carryforward	2,500								2,500
Portugal SIFIDE credit
Income Tax [Line Items]
Tax credit carryforward	5,000								5,000
Capital Loss Carryforward
Income Tax [Line Items]
Tax credit carryforward	7,800								7,800
Federal
Income Tax [Line Items]
Operating loss carryforwards	576,100								576,100
Federal | Research Tax Credit Carryforward
Income Tax [Line Items]
Tax credit carryforward	52,100								52,100
Foreign
Income Tax [Line Items]
Operating loss carryforwards	605,500								605,500
Tax credit carryforward	39,500								39,500
State
Income Tax [Line Items]
Operating loss carryforwards	442,500								442,500
State | Research Tax Credit Carryforward
Income Tax [Line Items]
Tax credit carryforward	$ 52,900								$ 52,900