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Income Taxes (Schedule of Reconciliation of Income Taxes at the Statutory Federal Income Tax Rate to Net Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Income Tax Disclosure [Abstract]
Federal income tax rate	21.00%	34.00%	34.00%
U.S. federal income tax (provision) benefit at statutory rate	$ (94,939)	$ (53,916)	$ 23,876
State tax expense	(4,690)	(8,282)	(6,520)
Change in valuation allowance	315,394	34,266	(6,377)
Research credits	18,308	0	0
Stock-based compensation	5,998	20,548	(3,155)
Non-deductible interest	0	(1,367)	(2,680)
Debt extinguishment	0	0	(4,726)
Other	(2,093)	4,401	(418)
Income tax benefit (provision)	$ 237,978	$ (4,350)	$ 0

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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