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Revenues - Revenues Disaggregated by Significant Customer (Details) - Customer Concentration Risk | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 02, 2021 | Apr. 03, 2020 | Jan. 01, 2021
Affiliates of CVS Health Corporation | Revenue |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Percent of total revenues | 15.00% | 18.00% |
Affiliates of CVS Health Corporation | Accounts Receivable |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Percent of total revenues | 12.00% |  | 11.00%
Affiliates of AmerisourceBergen Corporation | Revenue |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Percent of total revenues | 14.00% | 11.00% |
Affiliates of AmerisourceBergen Corporation | Accounts Receivable |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Percent of total revenues | 16.00% |  | 11.00%
Affiliates of McKesson Corporation | Revenue |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Percent of total revenues | 13.00% | 15.00% |
Affiliates of McKesson Corporation | Accounts Receivable |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Percent of total revenues | 18.00% |  | 12.00%
Ipsen Pharma SAS | Revenue |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Percent of total revenues | 13.00% | 13.00% |
Ipsen Pharma SAS | Accounts Receivable |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Percent of total revenues | 22.00% |  | 23.00%
Affiliates of Optum Specialty Pharmacy | Revenue |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Percent of total revenues | 9.00% | 12.00% |
Takeda Pharmaceutical Company Limited | Accounts Receivable |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Percent of total revenues | 5.00% |  | 10.00%

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