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Revenues - Revenues Disaggregated by Significant Customer (Details) - Customer Concentration Risk	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 01, 2021	Oct. 02, 2020	Oct. 01, 2021	Oct. 02, 2020	Jan. 01, 2021
Ipsen Pharma SAS | Revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	12.00%	16.00%	17.00%	16.00%
Ipsen Pharma SAS | Accounts Receivable
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues			24.00%		23.00%
Affiliates of McKesson Corporation | Revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	15.00%	12.00%	15.00%	13.00%
Affiliates of McKesson Corporation | Accounts Receivable
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues			19.00%		12.00%
Affiliates of CVS Health Corporation | Revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	16.00%	14.00%	15.00%	15.00%
Affiliates of CVS Health Corporation | Accounts Receivable
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues			13.00%		11.00%
Affiliates of AmerisourceBergen Corporation | Revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	16.00%	11.00%	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 Optum Specialty Pharmacy | Revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	9.00%	10.00%	9.00%	11.00%
Takeda Pharmaceutical Company Limited | Revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues	7.00%	10.00%	3.00%	7.00%
Takeda Pharmaceutical Company Limited | Accounts Receivable
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total revenues			3.00%		10.00%

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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