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Provision For (Benefit From) 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
	Jan. 01, 2021	Jan. 03, 2020	Dec. 28, 2018
Income Tax Disclosure [Abstract]
U.S. federal income tax provision at statutory rate	$ 27,476	$ 83,603	$ 94,939
State tax (benefit) expense	(2,232)	1,148	4,690
Change in valuation allowance	5,525	3,208	(315,394)
Research credits	(11,356)	(8,299)	(18,308)
Stock-based compensation	(20,399)	(9,177)	(5,998)
Non-deductible executive compensation	18,067	4,228	1,111
Branded prescription drug fee	2,537	1,099	371
Other	(562)	1,287	611
Provision for (benefit from) income taxes	$ 19,056	$ 77,097	$ (237,978)

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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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