Financial Instruments and Fair Value Measurements (Schedules of Concentration of Risk) (Details)	3 Months Ended			9 Months Ended
	Sep. 29, 2017	Dec. 30, 2016	Sep. 30, 2016	Sep. 29, 2017	Sep. 30, 2016
Distributor Concentration Risk | Net Sales Attributable to Distributors | McKesson Corporation
Concentration Risk
Concentration Risk, Percentage	9.00%		11.00%	9.00%	11.00%
Distributor Concentration Risk | Net Sales Attributable to Distributors | CuraScript, Inc
Concentration Risk
Concentration Risk, Percentage	41.00%		40.00%	40.00%	37.00%
Distributor Concentration Risk | Accounts Receivable Attributable to Distributors | McKesson Corporation
Concentration Risk
Concentration Risk, Percentage	20.00%	28.00%
Distributor Concentration Risk | Accounts Receivable Attributable to Distributors | Amerisource Bergen Corporation
Concentration Risk
Concentration Risk, Percentage	14.00%	15.00%
Distributor Concentration Risk | Accounts Receivable Attributable to Distributors | CuraScript, Inc
Concentration Risk
Concentration Risk, Percentage	14.00%	15.00%
Distributor Concentration Risk | Accounts Receivable Attributable to Distributors | Cardinal Health, Inc.
Concentration Risk
Concentration Risk, Percentage	11.00%	10.00%
Product Concentration Risk | Net Sales Attributable to Products | Acthar
Concentration Risk
Concentration Risk, Percentage	39.00%		37.00%	37.00%	34.00%
Product Concentration Risk | Net Sales Attributable to Products | Inomax
Concentration Risk
Concentration Risk, Percentage	16.00%		14.00%	16.00%	14.00%