Revenues - Revenues Disaggregated by Significant Customer (Details) - Customer concentration risk	12 Months Ended
	Jan. 02, 2026	Jan. 03, 2025	Dec. 29, 2023
Affiliates of Cencora, Inc. | Sales revenue, net
Concentration Risk [Line Items]
Percent of total revenues	22.00%	18.00%	17.00%
Affiliates of Cencora, Inc. | Accounts Receivable
Concentration Risk [Line Items]
Percent of total revenues	23.00%	17.00%
Affiliates of McKesson Corporation | Sales revenue, net
Concentration Risk [Line Items]
Percent of total revenues	19.00%	16.00%	17.00%
Affiliates of McKesson Corporation | Accounts Receivable
Concentration Risk [Line Items]
Percent of total revenues	25.00%	23.00%
Affiliates of CVS Health Corporation | Sales revenue, net
Concentration Risk [Line Items]
Percent of total revenues	15.00%	17.00%	17.00%
Affiliates of CVS Health Corporation | Accounts Receivable
Concentration Risk [Line Items]
Percent of total revenues	13.00%	20.00%
Accredo Health, Incorporated | Sales revenue, net
Concentration Risk [Line Items]
Percent of total revenues	12.00%	11.00%	12.00%
Affiliates of Optum Specialty Pharmacy | Sales revenue, net
Concentration Risk [Line Items]
Percent of total revenues	10.00%	9.00%	10.00%
Ipsen Pharma SAS | Sales revenue, net
Concentration Risk [Line Items]
Percent of total revenues	7.00%	15.00%	8.00%
Ipsen Pharma SAS | Accounts Receivable
Concentration Risk [Line Items]
Percent of total revenues	19.00%	18.00%
Cardinal Health, Inc. | Accounts Receivable
Concentration Risk [Line Items]
Percent of total revenues	12.00%	10.00%