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Organization and Summary of Significant Accounting Policies (Details)	3 Months Ended
	Apr. 03, 2020 USD ($) segment product $ / shares	Mar. 29, 2019 USD ($) $ / shares	Jan. 03, 2020 USD ($)
Organization And Summary Of Significant Policies [Line Items]
Number of business segments | segment	1
Selling, general and administrative	$ 62,940,000	$ 60,138,000
Decrease in earnings per share due to change in accounting estimate (USD per share) | $ / shares	$ (0.16)	$ (0.25)
Decrease in earnings per share diluted, due to change in accounting estimate (USD per share) | $ / shares	$ (0.15)	$ (0.24)
Branded Prescription Drug Fee, accrual	$ 13,400,000		$ 6,000,000.0
Branded Prescription Drug Fee, accrual, current	8,600,000		4,400,000
Branded Prescription Drug Fee, accrual, noncurrent	4,800,000		$ 1,600,000
Goodwill impairment	$ 0
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
New Information [Member]
Organization And Summary Of Significant Policies [Line Items]
Selling, general and administrative	$ 5,400,000
Decrease in earnings per share due to change in accounting estimate (USD per share) | $ / shares	$ 0.02
Decrease in earnings per share diluted, due to change in accounting estimate (USD per share) | $ / shares	$ 0.02

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