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Organization and Summary of Significant Accounting Policies (Narrative) (Details) | 12 Months Ended
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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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