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Revenues (Revenues Disaggregated by Significant Customer) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 03, 2020	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Sep. 29, 2018	Jun. 29, 2018	Mar. 31, 2018	Jan. 03, 2020	Dec. 28, 2018	Dec. 29, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 240,310	$ 271,703	$ 240,275	$ 215,487	$ 228,602	$ 225,397	$ 186,108	$ 213,719	$ 967,775	$ 853,826	$ 452,477
Ipsen | Sales revenue, net | Customer concentration risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total									16.00%	21.00%	15.00%
Affiliates of CVS Health Corporation | Sales revenue, net | Customer concentration risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total									15.00%	13.00%	16.00%
Affiliates of McKesson Corporation | Sales revenue, net | Customer concentration risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total									12.00%	12.00%	11.00%
Affiliates of AmerisourceBergen Corporation | Sales revenue, net | Customer concentration risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total									10.00%	8.00%	8.00%
Accredo Health, Incorporated | Sales revenue, net | Customer concentration risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total									9.00%	9.00%	11.00%
Diplomat Specialty Pharmacy | Sales revenue, net | Customer concentration risk
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percent of total									5.00%	9.00%	18.00%

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