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Organization and Summary of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Jan. 01, 2021 USD ($) product segment $ / shares	Jan. 03, 2020 USD ($)	Dec. 28, 2018 USD ($)
Organization And Summary Of Significant Policies [Line Items]
Number of operating segments | segment	1
Selling, general and administrative	$ 293,355,000	$ 228,244,000	$ 206,366,000
Impairment charge on goodwill	$ 0
Percent discount for prompt payment	2.00%
Discount expected to be earned	100.00%
Medicare Part D funding mandate	70.00%
Advertising expense	$ 25,100,000	$ 17,900,000	$ 14,800,000
Net foreign currency gains and losses	$ 900,000
Collaborative Arrangement with GlaxoSmithKline
Organization And Summary Of Significant Policies [Line Items]
Cost of goods sold is related to product	3.00%
Maximum
Organization And Summary Of Significant Policies [Line Items]
Estimated useful lives	15 years
Final Calculation Of Branded Prescription Drug Fee
Organization And Summary Of Significant Policies [Line Items]
Selling, general and administrative	$ 5,100,000
Decrease in earnings per share due to change in accounting estimate (in dollars per share) | $ / shares	$ (0.02)
Resulting From Discovery Efforts
Organization And Summary Of Significant Policies [Line Items]
Number of products that entered in the commercial marketplace | product	4
Products Derived from Cabozantinib
Organization And Summary Of Significant Policies [Line Items]
Number of products that entered in the commercial marketplace | product	2
Products Derived From Other Compounds
Organization And Summary Of Significant Policies [Line Items]
Number of products that entered in the commercial marketplace | product	2

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