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Revenues (Revenues Disaggregated by Significant Customer) (Details) - Sales revenue, net - Customer concentration risk
12 Months Ended
Jan. 01, 2021
Jan. 03, 2020
Dec. 28, 2018
Ipsen      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Percent of total 15.00% 16.00% 21.00%
Affiliates of CVS Health Corporation      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Percent of total 14.00% 15.00% 13.00%
Affiliates of McKesson Corporation      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Percent of total 12.00% 12.00% 12.00%
Affiliates of Optum Specialty Pharmacy      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Percent of total 11.00% 13.00% 14.00%
Affiliates of AmerisourceBergen Corporation      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Percent of total 11.00% 11.00% 9.00%